OSSDrop is a curated home for open-source tools — a community-maintained place to discover, share, and discuss developer tools, self-hosted apps, and libraries. Makers drop their own project with a single pull request. Every entry is a real open-source project: public repository, OSI license, honest one-line description. Star counts, icons, and trending update automatically, and no placement on this list is paid.

Browse by category below, explore the same tools ranked at ossdrop.com, discuss on r/OSSDrop, or drop your tool — it takes one PR and it's free.

_{The biggest star gains among listed tools in the last 7 days — measured, not editorialized.}

  

_{The heaviest hitters on the list — recomputed nightly.}

  

Tool	What it is	License	Stars	Links
Ollama	Run open large language models locally with a simple CLI and API — pull a model and start chatting or building.			code
Transformers	Hugging Face's library of pretrained models for text, vision, and audio — the standard toolkit for transformer models.			code
LangChain	Framework for building applications and agents powered by large language models.			code
llama.cpp	C/C++ library for running LLM inference locally on CPUs and GPUs.			code
Codex CLI	Terminal-based coding agent from OpenAI that reads, edits, and runs code in your local repository.			code
vLLM	Inference and serving engine for running large language models.			code
OpenHands	AI agent platform that writes code, runs shell commands, and browses the web to complete software engineering tasks.			code
Unsloth	Library for faster fine-tuning and training of large language models with lower memory use.			code
MetaGPT	Multi-agent framework that simulates a software company's roles to turn one-line requirements into code.			code
Cline	Autonomous coding agent for VS Code that can create and edit files, run terminal commands, and use a browser.			code
Open Interpreter	Terminal coding agent that lets open models such as DeepSeek, Kimi, and Qwen read, write, and run code.			code
AnythingLLM	Desktop and Docker app for chatting with documents and running local LLM-based agents.			code
Mem0	Memory layer that gives AI agents persistent, personalized recall across sessions.			code
crewAI	Framework for orchestrating role-based, collaborative multi-agent workflows, built independent of LangChain.			code
Goose	Extensible AI agent that can install, execute, edit, and test code locally with any LLM backend.			code
LlamaIndex	Python framework for connecting LLMs to external data via indexing, retrieval, and document agents.			code
Grok-1	Open-weights release of xAI's 314B-parameter Grok-1 large language model, with JAX example code.			code
Aider	AI pair programming in your terminal; edits files in your local git repo and commits as it goes.			code · docs
LibreChat	A self-hostable chat interface supporting multiple AI models and providers with multi-user auth.			code
LangGraph	Low-level framework from the LangChain team for building stateful, multi-step AI agents as graphs.			code
BitNet	Microsoft's official inference framework for running 1-bit large language models.			code
MediaPipe	Google's cross-platform framework for building on-device machine learning pipelines for media.			code
JAX	A Python library for array computing with automatic differentiation and JIT compilation to GPU/TPU.			code
GraphRAG	Microsoft's modular, graph-based retrieval-augmented generation (RAG) system.			code
Continue	Open-source AI coding assistant for VS Code and JetBrains that works with the models you choose.			code
Tabby	Self-hosted AI coding assistant with code completion and chat, an alternative to GitHub Copilot.			code
smolagents	Minimal Python library for building agents that act by writing and running code.			code
Semantic Kernel	SDK for integrating large language models into applications with plugins, planning and memory.			code
Haystack	Framework for building LLM applications with modular pipelines for retrieval, RAG, agents, and semantic search.			code
JARVIS	System that uses an LLM as a controller to connect and orchestrate machine learning models for multi-step tasks.			code
Gemma	Google DeepMind's open-weight LLM library, with JAX tooling to run and fine-tune the Gemma models.			code
Atomic Agent	Local-first CLI and TUI coding agent that runs open-weight models entirely on your machine, with no account or API key required.			code · docs
projectmem	Local-first, event-sourced memory + judgment layer for AI coding agents; warns before repeating a failed fix.			code · paper
RecurrentGemma	Google DeepMind's open-weight language model based on the Griffin architecture for fast, memory-efficient inference.			code
OrcaReplay	Records a coding agent's session and replays it offline, for developers debugging agent runs without spending tokens.			code
YYLO	Command-line orchestrator for coding agents, with typed task, validation, merge, and release-readiness boundaries across agent worktrees.			code
Jev Social	Local-first AI agent that routes social research through socai to capture browser evidence and stream a cited report.			code · docs
Mnemoverse	Hosted persistent memory for AI agents over MCP; tell it a recalled memory helped or misled and it re-ranks what comes back next.			code · docs
evex	Open registry of Eve agents you install with the shadcn CLI.			code · docs
Orchestrator	Free Mac workspace for developers to manage Codex tasks and review the resulting code changes.			code · docs
Skills Board	Shared library of AI agent skills for teams: curate recommended skills once, use them from GitHub, an install command, ZIP, or MCP.			code · docs
RuleBridge	CLI for normalizing and checking AI coding rules across agents and tools.			code
molt	Coding agent that won't say done on a false claim. Checks pass on disk or it refuses.			code

Tool	What it is	License	Stars	Links
VS Code	Microsoft's open-source code editor with rich extensions, debugging, and Git — the core of Visual Studio Code.			code
Oh My Zsh	Community framework for managing Zsh shell configuration, with plugins, themes, and helpers.			code
MarkItDown	Python tool and CLI for converting files and Office documents to Markdown.			code
Go	Google's open-source programming language for building simple, reliable, and efficient software.			code
React Native	Framework for building native iOS and Android apps using React.			code
Electron	Framework for building cross-platform desktop apps with JavaScript, HTML, and CSS.			code
three.js	JavaScript library for creating and rendering 3D graphics in the browser via WebGL.			code
D3.js	JavaScript library for producing data visualizations using SVG, Canvas, and HTML.			code
Tauri	Toolkit for building desktop and mobile apps with a web frontend and Rust backend.			code
TypeScript	Typed superset of JavaScript that compiles to plain JavaScript.			code
Deno	Runtime for JavaScript and TypeScript built on V8, with built-in tooling.			code
Windows Terminal	Terminal application for Windows with tabs, panes, and Unicode support.			code
Create React App	Command-line tool to scaffold a single-page React application with a preconfigured build setup.			code
Neovim	Hyperextensible, Vim-based text editor with a built-in language server client and Lua scripting.			code
Angular	TypeScript framework for building single-page web applications, maintained by Google.			code
Material UI	React component library implementing Google's Material Design.			code
Tailwind CSS	Utility-first CSS framework for styling web interfaces with composable classes.			code
Playwright	Microsoft's framework for reliable end-to-end browser testing across Chromium, Firefox, and WebKit.			code
Storybook	Tool for developing, documenting, and testing UI components in isolation.			code
Zed	High-performance, multiplayer code editor written in Rust, from the creators of Atom and Tree-sitter.			code
MCP Servers	Reference server implementations for the Model Context Protocol, the open standard connecting AI assistants to tools and data.			code
uv	Python package and project manager written in Rust.			code
Svelte	JavaScript framework that compiles components to minimal JavaScript at build time.			code
fzf	General-purpose command-line fuzzy finder for files, history, and processes; integrates with the shell and Vim.			code
Vite	Frontend build tool and development server for modern web projects.			code
lazygit	Simple terminal UI for Git commands.			code
act	Runs GitHub Actions workflows locally in Docker, for testing CI before pushing.			code
ripgrep	Fast recursive regex search over directories that respects your .gitignore.			code
Docusaurus	Static-site generator for building and maintaining documentation websites.			code
webpack	Module bundler that packs JavaScript and assets into bundled outputs, with code splitting and loaders.			code
Redux	Predictable state container library for JavaScript applications.			code
bat	A cat clone with syntax highlighting and Git integration.			code
Starship	Fast, customizable command-line prompt for any shell — shows git status, versions, and context at a glance.			code
React Router	Routing library for React applications, providing declarative navigation and data loading.			code
Vue.js	JavaScript framework for building user interfaces with a reactive, component-based model.			code
lazydocker	A terminal UI for managing Docker containers, images, and volumes.			code
Ionic Framework	Cross-platform UI toolkit for building iOS, Android, and web apps with HTML, CSS, and JavaScript.			code
Expo	Framework and platform for building universal native apps for Android, iOS, and web with React.			code
Prettier	Opinionated code formatter supporting JavaScript, TypeScript, CSS, and many other languages.			code
Guava	Google's set of core Java libraries including collections, caching, and utility classes.			code
Supervision	Python library of reusable computer vision utilities for object detection, tracking, and annotating images and video.			code
TanStack Query	Async state management and data-fetching library for React, Solid, Svelte, and Vue.			code
Ruff	Python linter and code formatter written in Rust.			code
tmux	Terminal multiplexer that runs and switches between multiple terminal sessions in a single window.			code
Monaco Editor	Browser-based code editor that powers VS Code, with syntax highlighting and IntelliSense.			code
GitHub CLI	GitHub's official command-line tool for managing pull requests, issues, releases, and other GitHub workflows.			code
Helix	A modal terminal text editor with built-in LSP support, in the tradition of Vim and Kakoune.			code
Bubble Tea	A Go framework for building terminal user interfaces based on the Elm architecture.			code
fd	A simple, user-friendly alternative to the Unix find command for searching files.			code
Babel	A JavaScript compiler that converts next-generation JavaScript into backwards-compatible code.			code
Gradio	A Python library for building web-based user interfaces and demos for machine learning models.			code
Apache Dubbo	A Java-based RPC and microservice framework for building distributed service applications.			code
Vim	A modal text editor for the terminal, extending the classic vi editor.			code
Chakra UI	A React component library for building accessible user interfaces.			code
esbuild	A bundler and minifier for JavaScript and TypeScript, written in Go for fast builds.			code
zoxide	A smarter cd command that learns your most-used directories, for faster navigation.			code
GoogleTest	Google's C++ unit testing and mocking framework.			code
k9s	A terminal UI for interacting with and managing Kubernetes clusters.			code
Tokio	Asynchronous runtime for Rust providing I/O, networking, scheduling, and timers for concurrent applications.			code
delta	A syntax-highlighting pager for git, diff, grep, and blame output.			code
Atuin	Replaces default shell history with a searchable database that can sync across machines.			code
Lighthouse	Automated tool that audits web pages for performance, accessibility, SEO, and other best practices.			code
Folly	C++ library of components developed and used at Facebook, extending the standard library.			code
hyperfine	A command-line benchmarking tool for comparing the runtime of commands.			code
ESLint	Pluggable linter that finds and fixes problems in JavaScript and TypeScript code.			code
vcpkg	C and C++ dependency manager for Windows, Linux and macOS.			code
FlatBuffers	Cross-platform serialization library that lets you access serialized data without parsing or unpacking it first.			code
WinGet	Windows Package Manager, with a CLI, PowerShell modules, and COM API for installing and managing software on Windows.			code
Bazel	Multi-language build and test system for building software at scale with reproducible, incremental builds.			code
Gum	Tool for adding interactive prompts, inputs, and styling to shell scripts.			code
Gson	Java library for converting Java objects to JSON and back.			code
Lexical	Extensible JavaScript text editor framework for building rich-text editing experiences on the web.			code
ONNX Runtime	Cross-platform runtime for machine learning model inference and training acceleration.			code
Jina	Framework for building and serving multimodal AI applications with a cloud-native stack.			code
PEFT	Library for parameter-efficient fine-tuning of large pretrained models.			code
ONNX	Open standard format for representing machine learning models across frameworks.			code
Candle	Minimalist machine learning framework for Rust focused on performance and small binaries.			code
Roslyn	.NET compiler for C# and Visual Basic with rich code analysis APIs.			code
tiktoken	Fast BPE tokenizer library for use with OpenAI's models.			code
.NET Runtime	Cross-platform runtime and libraries for .NET applications on cloud, mobile, desktop, and IoT.			code
SEMAPRAX	Pre-alpha agent-native systems language with deterministic semantic graphs and native and WebAssembly compiler lanes.			code · docs
Codex Quota Overlay	Windows tray overlay and local dashboard for Codex quota windows, reset times, pacing, forecasts, and usage activity.			code
zoxide-doctor	Read-only CLI for diagnosing zoxide PATH and shell initialization across Linux, macOS, and Windows.			code
Static Form Inspector	Dependency-free GitHub Action that finds risky static HTML form endpoints, methods, and omitted field names before deployment.			code
relnote	Offline stdlib Python CLI and GitHub Action for conventional-commit GitHub release notes; no API and no config file.			code
Sitemap Cohort Auditor	Node.js CLI for comparing sitemap URL cohorts between releases and reporting declared URL and image coverage.			code

Tool	What it is	License	Stars	Links
React	Meta's JavaScript library for building user interfaces from reusable components.			code
Flutter	Google's UI toolkit for building natively compiled apps for mobile, web, and desktop from one codebase.			code
Next.js	Vercel's React framework for production — full-stack rendering, routing, and built-in optimizations.			code
Supabase	Open-source Firebase alternative: a Postgres database with auth, storage, realtime, and auto-generated APIs.			code
FastAPI	Modern, high-performance Python web framework for building APIs, with automatic docs and type validation.			code
Bun	Fast all-in-one JavaScript runtime, bundler, test runner, and package manager, built as a drop-in for Node.			code
Django	Python web framework for building server-side web applications and APIs.			code
Gin	HTTP web framework for Go, built on httprouter, used for REST APIs and microservices.			code
Spring Boot	Java framework for building stand-alone, production-grade Spring applications and services.			code
Hoppscotch	API development environment in the browser: REST, GraphQL, and realtime clients; self-hostable.			code · docs
NestJS	Node.js framework for server-side applications in TypeScript, using Angular-style modules and dependency injection.			code
JSON Server	Spins up a fake REST API with CRUD endpoints from a JSON file, for prototyping frontends without a backend.			code
Flask	Python micro web framework for building web applications and APIs.			code
Express	Minimalist web framework for Node.js, used to build HTTP servers and APIs.			code
Traefik	Reverse proxy and load balancer for microservices, with automatic service discovery and HTTPS via Let's Encrypt.			code
Nuxt	Full-stack framework for building Vue.js web applications.			code
Bruno	Desktop API client for designing and testing HTTP APIs, storing request collections as plain files.			code
gRPC	RPC framework using HTTP/2 and Protocol Buffers for cross-language service-to-service communication.			code
Kong Gateway	API gateway that manages, secures, and routes traffic between clients and backend or microservice APIs.			code
Fiber	An Express-inspired web framework written in Go and built on the Fasthttp engine.			code
Insomnia	Desktop API client for testing REST, GraphQL, WebSocket, SSE, and gRPC requests, an alternative to Postman.			code
HTTPie	User-friendly command-line HTTP client with JSON support and syntax highlighting.			code · docs
ASP.NET Core	A cross-platform .NET framework for building web applications and services.			code
Fastify	Web framework for Node.js focused on low overhead and JSON schema-based request/response handling.			code
SolidJS	A declarative JavaScript library for building user interfaces with fine-grained reactivity.			code
Remix	Full-stack React web framework focused on web standards, server rendering, and nested routing.			code
Echo	Minimalist web framework for Go for building HTTP servers and REST APIs.			code
OpenAI Python	Official Python client library for accessing the OpenAI REST API.			code
Symfony	PHP web framework and set of reusable components for building web applications.			code
Actix Web	Web framework for Rust for building HTTP servers and APIs.			code
YunCMS	Self-hosted MySQL CMS and REST backend with a React Studio, role-based access control, files, extensions, and MCP.			code · docs
MailKite SaaS Starter	Next.js SaaS starter for developers: auth, Stripe subscriptions and teams run inside your own app, with no auth vendor needed.			code

Tool	What it is	License	Stars	Links
Apache Superset	Data exploration and visualization platform for building dashboards and charts on existing databases.			code
Chart.js	JavaScript library for creating charts using the HTML5 canvas element.			code
Apache ECharts	JavaScript charting and data visualization library for the browser.			code
scikit-learn	Machine learning library for Python with tools for classification, regression, and clustering.			code
Keras	Deep learning API for Python that runs on multiple backend frameworks.			code
Meilisearch	Fast, typo-tolerant search engine with a simple API.			code · docs
etcd	Distributed key-value store used for shared configuration and service discovery, notably within Kubernetes.			code
ClickHouse	Column-oriented database management system for real-time analytics over very large datasets.			code
pandas	Python library for data analysis and manipulation with labeled table and series data structures.			code
Prisma	TypeScript and Node.js ORM for PostgreSQL, MySQL, SQLite, SQL Server, MongoDB, and other databases.			code
Apache Airflow	Platform to author, schedule, and monitor data pipelines as directed acyclic graphs (DAGs).			code
Milvus	Vector database for storing and searching embeddings, used for similarity search in AI applications.			code
Streamlit	Python framework for building and sharing interactive data apps and dashboards without front-end code.			code
Apache Spark	A unified analytics engine for large-scale distributed data processing and machine learning.			code
Ray	A distributed computing framework for scaling Python and machine learning workloads across clusters.			code
DeepSpeed	A deep learning optimization library for distributed training and inference of large models.			code
DuckDB	In-process analytical SQL database; runs OLAP queries inside your app or notebook.			code · docs
Faiss	A library for efficient similarity search and clustering of dense vectors.			code
TiDB	Distributed SQL database that is MySQL-compatible, supporting both transactional and analytical workloads.			code
Polars	A DataFrame library and query engine written in Rust, with Python and other bindings.			code
LevelDB	A Google key-value storage library providing an ordered mapping from string keys to values.			code
TypeORM	An ORM for TypeScript and JavaScript supporting PostgreSQL, MySQL, SQLite, and other databases.			code
Drizzle ORM	A TypeScript ORM for SQL databases with a typed query builder.			code
Qdrant	High-performance vector database and search engine for embeddings — powers semantic search and RAG.			code
Apache Kafka	Distributed event streaming platform for publishing, subscribing to, storing, and processing streams of records.			code
RocksDB	Embeddable, persistent key-value store library optimized for fast storage; used as a storage engine in other databases.			code
Sequelize	Node.js and TypeScript ORM supporting PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, Oracle, DB2 and more.			code
Chroma	Vector database for storing and querying embeddings to power search and retrieval in AI applications.			code
Redash	Connects to SQL and NoSQL data sources to build queries, visualizations, and dashboards.			code
PostgREST	Turns an existing PostgreSQL database directly into a RESTful API, generated from the schema.			code
Valkey	High-performance in-memory key-value data store; a community-driven fork of Redis under an open license.			code
Apache Flink	Distributed engine for stateful stream and batch processing over unbounded and bounded data streams.			code
Neon	Serverless Postgres that separates storage and compute for autoscaling, database branching, and scale to zero.			code
Apache RocketMQ	Distributed messaging and streaming platform for building event-driven applications.			code
Hugging Face Datasets	Python library for loading, processing, and sharing machine learning datasets.			code
Vitess	Database clustering system that shards and scales MySQL horizontally; originally built at YouTube.			code
QuestDB	Time-series database for high-throughput ingestion and SQL analytics.			code
Apache Arrow	Columnar in-memory data format and multi-language toolbox for fast data interchange and analytics.			code
Weaviate	Vector database that stores objects and vectors and combines vector search with structured filtering.			code
Apache Pulsar	Distributed pub-sub messaging and streaming platform.			code
Apache Druid	Real-time analytics database for fast queries over large event and time-series datasets.			code

Tool	What it is	License	Stars	Links
Kubernetes	Production-grade container orchestration to automate deployment, scaling, and management of containerized apps.			code
Immich	Self-hosted photo and video backup and management solution, an alternative to Google Photos.			code
Uptime Kuma	Self-hosted uptime monitoring tool with status pages and notifications.			code
code-server	Runs VS Code on a remote server, accessible through a web browser.			code
Grafana	Open observability platform to query, visualize, and alert on metrics, logs, and traces.			code
Caddy	Web server and reverse proxy with automatic HTTPS by default, configured in a simple, readable file.			code
Moby	Open-source framework and components for assembling container-based systems, underlying Docker.			code
Ansible	Agentless IT automation tool for configuration management, application deployment, and orchestration over SSH.			code
Prometheus	Monitoring system and time-series database with a query language and alerting.			code
Coolify	Self-hostable platform to deploy apps, databases, and static sites; an open alternative to Heroku and Netlify.			code
PocketBase	Open-source backend with database, auth, and file storage in a single file.			code
Gitea	Self-hosted Git service with code review, package registry, and CI/CD, similar to GitHub or GitLab.			code
Appwrite	Self-hosted backend platform providing auth, databases, storage, functions, and messaging for web and mobile apps.			code
LocalAI	Self-hosted, OpenAI-compatible API for running LLMs, image, audio, and video models locally on consumer hardware.			code
Text Generation WebUI	Desktop web UI for running local large language models with text, vision, and an OpenAI-compatible API.			code
Headscale	Self-hosted, open-source implementation of the Tailscale control server.			code
Umami	A self-hosted, privacy-focused web analytics platform that runs without cookies.			code
Portainer	Web UI to manage Docker, Swarm, and Kubernetes — deploy, monitor, and control containers from a browser.			code
Docker Compose	A tool for defining and running multi-container Docker applications from a YAML file.			code
AdGuard Home	Network-wide DNS server that blocks ads and trackers for every device on a network.			code
restic	Command-line backup program that encrypts and deduplicates data to local or cloud storage.			code
K3s	Lightweight, single-binary Kubernetes distribution for edge, IoT, and resource-constrained environments.			code
Helm	Package manager for Kubernetes that defines, installs and upgrades applications using charts.			code
OpenTofu	Infrastructure-as-code tool to provision cloud and on-prem resources declaratively; community-driven fork of Terraform.			code
Plausible Analytics	Self-hostable, cookie-free web analytics as a privacy-focused alternative to Google Analytics.			code
Authelia	Self-hosted single sign-on and multi-factor authentication portal that sits in front of reverse proxies.			code
Envoy	Cloud-native L7 proxy and communication bus used for edge, middle and service-to-service networking.			code
Jenkins	Self-hosted automation server for building, testing, and deploying software through CI/CD pipelines.			code
Rancher	Platform for deploying and managing Kubernetes clusters and containerized workloads across environments.			code
Pulumi	Infrastructure-as-code tool for defining and deploying cloud resources using general-purpose programming languages.			code
Cilium	eBPF-based tool providing networking, security, and observability for Kubernetes and container workloads.			code
Argo CD	Declarative GitOps continuous delivery tool for deploying and syncing applications to Kubernetes.			code
Matomo	Self-hosted web analytics platform and privacy-focused alternative to Google Analytics.			code
containerd	Container runtime for managing the complete container lifecycle on a host.			code
OpenSRE	Self-hosted AI SRE for incident investigation with episodic memory, a knowledge graph, Web UI, Slack, and Teams.			code · docs

Tool	What it is	License	Stars	Links
LocalSend	Cross-platform app for sending files between devices on the same local network, an alternative to AirDrop.			code
Syncthing	Continuous, peer-to-peer file synchronization between your devices — private, encrypted, no cloud required.			code
rclone	Command-line program to sync, copy, and manage files across dozens of cloud storage providers.			code
croc	Command-line tool for sending files and folders between computers over an encrypted relay connection.			code
qBittorrent	BitTorrent client with a Qt-based desktop interface and a built-in web UI for remote management.			code
Nextcloud Server	Self-hosted file sync and share platform with collaboration apps, an alternative to Dropbox or Google Drive.			code
File Browser	Web-based file manager for browsing, uploading, and sharing files stored on a server, accessed through a browser.			code
SeaweedFS	Distributed file and object storage system with an S3-compatible API, built to handle very large numbers of files.			code
Magic Wormhole	Sends files and short messages between two computers, paired using a one-time human-readable code.			code
Duplicati	Backup client that encrypts files and uploads them to cloud storage providers such as S3, Backblaze, and Google Drive.			code
Kopia	Cross-platform backup tool with client-side end-to-end encryption, deduplication, and a CLI plus GUI.			code
Open Download Manager	Native GTK4 download manager for Linux with one queue for HTTP/FTP, BitTorrent, video and site mirrors via aria2, yt-dlp and HTTrack.			code

Tool	What it is	License	Stars	Links
Vaultwarden	Lightweight, self-hostable server compatible with Bitwarden clients — run your own password manager.			code
Metasploit Framework	Penetration testing framework with exploit development and vulnerability verification tools.			code
Trivy	Scanner for vulnerabilities, misconfigurations, and exposed secrets in containers, code, and cloud infrastructure.			code
Keycloak	Identity and access management server with SSO, OAuth2, OpenID Connect, and user federation.			code
Nuclei	Vulnerability scanner that runs YAML-based templates against apps, APIs, networks, DNS and cloud configurations.			code
Gitleaks	Scans git repositories and files for hardcoded secrets like API keys and passwords.			code
KeePassXC	Cross-platform, offline password manager; community continuation of KeePass.			code · docs
age	Simple file encryption tool and Go library with small explicit keys and no configuration options.			code
sops	Encrypts and decrypts values in YAML, JSON, ENV, and INI files, integrating with cloud KMS providers.			code
Wazuh	Open-source security platform combining SIEM and XDR for endpoint and cloud workload monitoring.			code
Cryptomator	Client-side, password-based encryption for your cloud files, across desktop and mobile.			code
OWASP ZAP	Web application security scanner for finding vulnerabilities during testing and development.			code
Authier	Open-source password manager with browser autofill, encrypted vault sync, TOTP codes, and trusted-device approval.			code · docs

Tool	What it is	License	Stars	Links
PowerToys	Microsoft's set of power-user utilities for Windows: window management, bulk rename, color picker, and more.			code
Excalidraw	Virtual whiteboard for sketching hand-drawn-style diagrams and wireframes, with live collaboration.			code
AppFlowy	Open-source Notion alternative for notes, docs, and project boards — local-first and self-hostable.			code
Cal.com	Open-source scheduling and appointment-booking platform, an alternative to Calendly.			code
Paperless-ngx	A document management system that scans, indexes, and archives physical documents into a searchable digital archive.			code
Windows Calculator	The calculator application that ships with Windows, supporting standard, scientific, and programmer modes.			code
Rectangle	Move and resize macOS windows with keyboard shortcuts and drag-to-snap areas.			code
Super Productivity	Todo list app with built-in time tracking and Jira/GitLab/GitHub integrations.			code
Wekan	Self-hosted kanban board application, an alternative to Trello.			code
Linkwarden	Self-hosted bookmark manager for collecting, annotating, and archiving links.			code
ActivityWatch	Cross-platform automatic time tracker that logs app and website usage locally.			code
Etherpad	Real-time collaborative plain-text and rich-text document editor.			code
FreshRSS	Self-hostable RSS and Atom feed aggregator.			code
Documenso	Self-hosted document signing platform and an alternative to DocuSign.			code
Espanso	Cross-platform text expander for snippets and templates, written in Rust.			code
Mealie	Self-hosted recipe manager and meal planner with a REST API backend and web frontend.			code
GemType	Free, open-source Grammarly alternative: AI grammar checks and rewrites in Chrome, Edge, Firefox, Word, and a desktop app.			code
AI Dictation	Cross-platform speech-to-text app for voice typing with offline recognition and optional text cleanup.			code
Plainsay	Native macOS dictation that runs Whisper and Parakeet locally and types into any app.			code
ProofKey	Grammarly-style grammar checks and rewrites in Chrome, sent only to your own LLM API key or a local model. No backend, no telemetry.			code
Mluva	Native GTK4 dictation and editable rewrites for Omarchy, with searchable history and a Quickshell widget.			code
SessionSifu	Restores desktop applications, documents, workspaces, and window layouts, with an optional private local visual timeline.			code

Tool	What it is	License	Stars	Links
Memos	Self-hosted, lightweight note-taking service built for quick capture, with Markdown support.			code
Joplin	Privacy-focused, open-source note-taking and to-do app with end-to-end encrypted sync across devices.			code
SiYuan	Self-hosted personal knowledge management app with block-based editing and Markdown/WYSIWYG support.			code
Logseq	Privacy-first, local-first knowledge base for networked notes and outlines over plain Markdown files.			code
Payload	A TypeScript headless CMS and application framework built on Next.js with an admin panel.			code
Trilium	Self-hosted, hierarchical note-taking application for building a personal knowledge base.			code
Anki	Spaced-repetition flashcard program for memorizing information over time.			code
Karakeep	Self-hostable app for saving links, notes and images with automatic tagging and full-text search.			code
Wiki.js	Self-hosted wiki application built on Node.js with Markdown/WYSIWYG editing and Git-backed storage.			code
Docmost	Self-hosted collaborative wiki and documentation tool, an open-source alternative to Confluence and Notion.			code
Foam	VS Code extension for personal knowledge management using linked Markdown notes, inspired by Roam Research.			code
Notesnook	End-to-end encrypted note-taking app, an alternative to Evernote, with cross-device sync.			code
PuppyOne	Local-first workspace where you and your AI work on the same project files with built-in version history.			code

Tool	What it is	License	Stars	Links
Mastodon	Self-hosted social networking server using ActivityPub; a federated alternative to X/Twitter.			code
Discourse	Discussion forum and community platform with topics, categories, and moderation tools.			code
Rocket.Chat	Self-hosted team chat with channels, video calls, and integrations; an alternative to Slack. Core is MIT; ee/ subdirectory has a separate…			code
Mattermost	Self-hosted team messaging and collaboration platform, AGPL-licensed; an alternative to Slack.			code
Chatwoot	Self-hosted customer support and live-chat platform; an alternative to Intercom or Zendesk. Core is MIT; enterprise/ has a separate license.			code
Jitsi Meet	Encrypted, self-hostable video conferencing — start or join a meeting from the browser, no account needed.			code
Signal (Android)	Android client for the Signal end-to-end encrypted messaging app.			code
Zulip	Team chat organized by topic threads within channels; an alternative to Slack.			code
SimpleX Chat	Private messaging network and apps that operate without user identifiers, for iOS, Android, and desktop.			code
Signal Desktop	Private messenger desktop app for Windows, macOS, and Linux.			code
Lemmy	Federated link-aggregation and discussion platform using ActivityPub; an alternative to Reddit.			code
Element (Web)	Web client for the Matrix messaging protocol, with encrypted chat, voice, and video calls.			code
OpenPost	Self-hosted social media scheduler for publishing to Bluesky, Mastodon, X, LinkedIn, Threads, and more.			code · docs

Tool	What it is	License	Stars	Links
Home Assistant	Open-source home automation that puts local control and privacy first, integrating thousands of devices.			code
Huginn	Self-hosted system for building agents that monitor events and automate actions, similar to IFTTT.			code
Frigate	Local network video recorder with real-time object detection for IP cameras, no cloud video upload required.			code
Tasmota	Open-source firmware for ESP8266/ESP32 smart devices, enabling local MQTT/HTTP control without a cloud dependency.			code
Node-RED	Low-code, flow-based tool for wiring together APIs, devices, and services — visual automation in the browser.			code
ThingsBoard	IoT platform for device management, data collection, processing, and visualization.			code
Zigbee2MQTT	Bridges Zigbee devices to MQTT, letting users control Zigbee hardware without a vendor-specific hub.			code
ESPHome	Firmware framework for ESP32/ESP8266 microcontrollers, configured via YAML files and used to build smart-home devices.			code
Eclipse Mosquitto	Lightweight, widely used MQTT message broker for IoT and machine-to-machine messaging.			code
FreeRTOS	Real-time operating system kernel for microcontrollers, widely used in embedded and IoT devices.			code
ioBroker	Integration platform for home automation and IoT, connecting many devices and protocols through one system.			code

Tool	What it is	License	Stars	Links
Twenty	Customer relationship management platform positioned as an open alternative to Salesforce.			code
Odoo	Modular business application suite covering CRM, inventory, accounting, and e-commerce.			code
Metabase	Business intelligence tool for querying databases and building dashboards without SQL.			code
Qlib	AI-oriented quantitative investment platform for building and running machine-learning trading strategies in Python.			code
ERPNext	Enterprise resource planning system covering accounting, inventory, manufacturing, and HR.			code
Actual Budget	Local-first personal budgeting app using envelope budgeting, an alternative to YNAB.			code
Firefly III	Self-hosted personal finance manager to track accounts, budgets, and bills, with reports and rules.			code
Ghostfolio	Tracks investment portfolios across stocks, ETFs, and crypto with performance reporting.			code
Dolibarr	Web-based ERP and CRM for managing invoices, orders, stock, and accounting.			code
Beancount	Double-entry accounting system that stores transactions as plain text files.			code
Posnic	Offline-first open source POS and billing software for retail and restaurants, with online/offline workflows and public AGPL source.			code · docs
Client Close Kit	Free MIT browser freelance docs: invoices, quotes, credit notes, certificates of completion, and more. No signup.			code

Tool	What it is	License	Stars	Links
TensorFlow	Google's end-to-end open-source platform for machine learning, from research to production.			code
PyTorch	Meta's Python-first deep-learning framework with strong GPU acceleration and dynamic graphs.			code
OpenCV	Computer vision and image-processing library with C++, Python, and Java interfaces.			code
Tesseract	Optical character recognition engine that extracts text from images.			code
Ultralytics YOLO	Python framework for YOLO models doing object detection, segmentation, classification, pose estimation, and tracking.			code
Segment Anything (SAM)	Meta's image segmentation model with inference code, pretrained checkpoints, and example notebooks.			code
Manim	Python library for programmatically creating precise mathematical animations and diagrams.			code
Detectron2	PyTorch library from Facebook AI Research for object detection, segmentation, and other visual recognition tasks.			code
CLIP	Neural network from OpenAI that links images and text to predict the most relevant caption for an image.			code
MMDetection	OpenMMLab PyTorch toolbox and benchmark for object detection and instance segmentation models.			code
XGBoost	Gradient boosting library for Python, R, Java, Scala and more, running on single machines or distributed clusters.			code
MLflow	Platform for managing the machine learning lifecycle including tracking, evaluation, deployment and model registry.			code
LeRobot	Library of models, datasets and tools for applying end-to-end machine learning to real-world robotics.			code
Prophet	Library for forecasting time series data with multiple seasonality and linear or non-linear growth.			code
TRL	Library for training transformer language models with reinforcement learning, including SFT, PPO, and DPO.			code
LightGBM	Gradient boosting framework based on decision tree algorithms for ranking, classification, and other ML tasks.			code
torchvision	Datasets, model architectures, and image transforms for computer vision built on PyTorch.			code
JupyterLab	Web-based interactive development environment for notebooks, code, and data across many languages.			code
QGIS	Free, cross-platform desktop GIS for creating, editing, analysing, and publishing geospatial data.			code
Blockly	Library for building visual, block-based programming editors, used in Scratch-like coding tools.			code
OpenRefine	Desktop tool for cleaning, transforming, and reconciling messy tabular data.			code
Stellarium	Planetarium software that renders a realistic 3D sky for astronomy education and stargazing.			code
CodeCombat	Browser game that teaches programming by having players write code to control characters.			code
Open edX Platform	Learning management system built for MOOCs, powering edX and other online course platforms.			code
Moodle	Learning management system for hosting online courses, assignments, and grades, used by schools and universities.			code
Astropy	Core Python library for astronomy and astrophysics, providing common tools for the field.			code
AcadGIS	Publication-ready study-area maps, choropleths, and locator insets for research papers, in Python.			code
Yard Material Coverage	Open landscape material coverage data and a reusable calculator component for yard planning.			code
Temperature Scale Reference	Dependency-free browser calculator and JavaScript reference for converting Celsius, Fahrenheit, kelvin, and Rankine.			code

Tool	What it is	License	Stars	Links
yt-dlp	Command-line tool for downloading video and audio from YouTube and many other sites.			code
Stable Diffusion web UI	Browser-based interface for generating images with Stable Diffusion models.			code
ComfyUI	Node-based interface and backend for building image generation workflows with diffusion models.			code
Whisper	OpenAI's robust multilingual speech-to-text model for transcription and translation.			code
OBS Studio	Free, open-source software for live streaming and screen recording.			code · docs
Penpot	Web-based design and prototyping tool for UI/UX with open file formats and developer handoff.			code
Jellyfin	Self-hosted media server for streaming your movies, TV shows, and music library.			code
VibeVoice	Microsoft's open-source frontier text-to-speech model for long-form, multi-speaker conversational audio.			code
Material Design Icons	Google's icon set (Material Symbols) for use in web and app interfaces.			code
PixiJS	JavaScript 2D rendering library using WebGL and Canvas for interactive graphics, games, and web content.			code
LosslessCut	GUI tool for fast, lossless trimming and cutting of video and audio files.			code
PhotoPrism	Self-hosted photo app with AI-based search, tagging, and album organization.			code
Diffusers	PyTorch library of diffusion models for generating images, video, and audio, from Hugging Face.			code
HandBrake	Tool for converting video from nearly any format to a selection of modern codecs.			code
p5.js	JavaScript library for creative coding, drawing graphics and interactive visuals in the browser.			code
Navidrome	Self-hosted music server and streaming service compatible with Subsonic API clients.			code
Blender	Free 3D creation suite: modeling, sculpting, animation, simulation, rendering, and video editing.			code
VLC media player	Cross-platform media player that plays most audio and video formats and streams.			code
Audacity	Multi-track audio editor and recorder for Windows, macOS, and Linux.			code
PeerTube	Federated, peer-to-peer video hosting platform, an alternative to YouTube.			code
Shotcut	Cross-platform, free video editor supporting a wide range of formats.			code
Calypso	A JavaScript and REST API-based interface for reading, managing, and publishing to WordPress.com and Jetpack-connected sites.			code
ACE-Step	An open-source foundation model for music generation, built for fast, controllable, full-length track synthesis.			code
MLVC	Microsoft's open-source learned video codec — neural-network video compression for real-world, multi-platform deployment.			code
NextGenUp	Upscales photos to 8K and video to 4K on your own machine using Real-ESRGAN, with GFPGAN face restoration. No cloud, no watermark.			code
ItsPaint	Native macOS paint and screenshot markup app for anyone who wants MS Paint on a Mac.			code
lodsmith	Blender add-on that builds named low-poly indie game props from JSON recipes with known triangle budgets.			code
CreateForge UI Lab	Local-first browser tool for comparing 17 AI image and video model profiles and exporting model-aware creative briefs.			code
SHAR Production Metadata Linter	MIT-licensed CLI that validates rights-aware metadata for AI-hybrid video-production deliveries.			code

Built something open source? Add one entry to data/tools.json and open a PR — see CONTRIBUTING.md. One tool per PR. Stars, icons, and trending are computed automatically; descriptions stay honest.

What is OSSDrop? OSSDrop is a curated, community-maintained list of open-source tools, organized into categories spanning AI and coding agents, developer tools and CLI utilities, web and APIs, data and databases, DevOps and self-hosted software, files and sync, security and privacy, productivity, notes and knowledge, communication and social, automation and IoT, finance and business, science and education, and creator and media tools.

Is OSSDrop a Product Hunt alternative for open source? People often describe it that way. Like a product-launch site, OSSDrop is a place to discover new open-source software — developer tools, self-hosted apps, and libraries — and give the good ones votes and discussion. The difference: OSSDrop lists only projects with a public repository and an OSI-approved open-source license, and listing is always free.

How do I add my open-source tool to the list? Fork this repository, add one JSON object to data/tools.json, and open a pull request. Requirements: a public repository and an OSI-approved license. See CONTRIBUTING.md.

Is listing free? Can rankings be bought? Listing is free and rankings cannot be bought. Tables are sorted by live GitHub star count and “Trending this week” is computed from daily star snapshots. The one pinned showcase card is always labeled as pinned.

Where else does OSSDrop live? On the web at ossdrop.com — now live — where the same tools are ranked and open for discussion, and on Reddit at r/OSSDrop. The GitHub organization is github.com/OSSDrop.

Can I reuse this list's data? Yes — the list content is public domain (CC0-1.0), and data/tools.json is the machine-readable source of truth. Each linked tool keeps its own license.

_{Star counts and licenses render live via shields.io; trending is computed from daily snapshots in data/stars.json.}