The gamedev-resources's intro from Kavex

💲 = Paid, 🚩 = Limited Free, 🆓 = 100% Free, 🅾️ = Open Source

Please remember to always look at the license before using something in your project.

Assets
Code
Design
Meta
Tutorials

Assets

2D Assets

🆓 2D Cartoon Mobile Game UI Pack - cartoon user interface asset pack. It comes as a layered psd file.
🆓 420 Pixel Art Icons for RPGs - Set of 420 RPG icons, free for commercial use.
💲 GameartGuppy - Cheap 2D Assets
🆓 Games-Icons Set - free icons for your games.
🆓 Iconmonstr - Another free icons resource for your games.
🚩 Kenny Assets - Royalty free assets
🆓 OpenClipart - Collection of free cliparts.
💲 Oryx Design Lab - Cheap high quality royalty free sprites
🆓 SpriteLib - a collection of static and animated graphic objects (also commonly known as sprites).
🚩 Time Fantasy - Lovely SNES-Looking RPG Assets

3D Assets

🆓 Blender 3D models - 3D models, particle systems/effects
🆓 Matcaps - A Huge library of matcap textures in PNG and ZMT, organized by color.
🆓 Poly Pizza - Searchable library of low poly creative commons 3D models
🆓 Reiner's Tilesets - A blog with free 2D and 3D graphics.
🆓 3DModelsCC0 - Public domain 3D models

Audio Assets

🆓 GameSounds - Archive of all kinds of royalty-free game sounds.
🆓 FreePD - Public Domain Music
🆓 FreeSFX - free sound effects
🆓 Freesound - collaborative database of Creative Commons Licensed sounds
🆓 Kavex's GameSounds - Free sounds for any use
🆓 Musopen - Royalty free music.
💲 Nameless: the Hackers RPG Soundtrack - high-quality by BoxCat Games
🆓 Octave - free library of UI sounds, handmade for iOS.
🆓 PacDV - royalty free sounds collection.
🆓 SoundBible.com - Royalty-free of sound effects under various licenses.

Multiple Graphic Collections

🚩 CGTextures - A large collection of textures.
💲 GameDev Market - a community-driven marketplace that connects indie game developers with talented asset creators.
🚩 LotPixel - A huge assets library. Photogrammetry and PBR Textures, 3D Models, Decals. 1500+ Free Texture Available.
🆓 OpenGameArt - a media repository intended for use with free software game projects.
🆓 PlainTextures - Free high resolution textures, brushes and photos
🚩 Sketchfab - Publish & embed interactive 3D models.
🆓 Vecteezy - Free Vector Art.

Code

Ads and Monetization

AdMob by Google - Google's Ads and monetization service for mobile.
Appodeal - A programmatic ad mediation solution for mobile apps.
Unity Ads - Unity3D Official Ads SDK.

2D Engines and Frameworks

🅾️ Allegro - Allegro 4 & 5 are cross-platform, open source, game programming libraries, primarily for C and C++ developers.
🅾️ Bladecoder - Classic point and click adventure game engine and editor.
🅾️ Box2D - A 2D Physics Engine for Games.
🅾️ Chipmunk C# - C# implementation of the Chipmunk2D lib.
🅾️ Chipmunk2D - A fast and lightweight 2D game physics library.
🅾️ Cocos2D - graphic library for games and multimedia, for python language
🆓 Cocos2d-x - a C++ OpenGL 2D and 3D game engine. Uses C++ but has JS and Lua bindings.
🚩 Construct 2 - an HTML5 game maker, meaning you are not actually writing JavaScript. Instead, you use actions, events and conditions to do the heavy lifting.
🅾️ Coquette - A micro framework for JavaScript games. Handles collision detection, the game update loop, canvas rendering, and keyboard and mouse input.
🆓 Defold 2D game engine by King
🆓 EasyRPG - role playing game creation tool compatible with RPG Maker 2000/2003 games
🅾️ ENGi - A multi-platform 2D game library for Go.
🅾️ Ejecta - A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS.
🅾️ EnchantJS - A simple JavaScript framework for creating games and apps (old).
💲 GameMaker - Very good 2d engine if you are only interested in 2d
💲 GameSalad - Game Creation Engine for Mac and Windows.
🅾️ Gideros - Mobile Cross-Platform framework using Lua programming language.
🅾️ Glide Engine - Game engine for making 2d games on iOS, macOS and tvOS, with practical examples.
🅾️ Gosu - 2D game development library for Ruby and C++
🅾️ HaxeFlixel - Create cross-platform games easier and free in Haxe.
🅾️ HEAPS.io - A mature cross-platform graphics engine for high performance games written in Haxe.
🅾️ iio.js - A javascript library that speeds the creation and deployment of HTML5 Canvas applications
🅾️JNGL - 2D C++ Cross-Platform engine for Nintendo Switch, Xbox, Linux, Windows, OS X, Web, Android, iOS and more.
🅾️ Juno TypeScript - Clean and lightweight 2D game framework written in TypeScript
🅾️ Kivent - A 2D game framework for Kivy.
🅾️ Kivy - Cross platform Python framework for creating apps and games for Linux, Windows, OS X, Android and iOS
🅾️ LibGDX - Powerful (totally free) library for Java, code once and run the game on desktop, Android, Web, and iOS.
🅾️ Lums - A 2D / 3D framework written in C++11. Very efficient and modern. Still under heavy development.
🅾️ LÖVE - Lua 2D Game Engine, very good game jam engine.
🅾️ MINX - Open Source 2D game framework written in C++ (to the style of XNA)
🅾️ Matter.js - a 2D physics engine for the web.
🅾️ MelonJS - open source light-weight HTML5 game engine.
🅾️ Monogame - Open Source implementation of the Microsoft XNA 4 Framework.
🆓 NodeBox - a family of Python tools to create generative design.
🅾️ OpenFL - Open Source Haxe Engine for making multi-platform games.
🅾️OpenRA - OpenRA is a Libre/Free Real Time Strategy Game Engine.
💲 PICO-8 - A fantasy console for making, sharing and playing tiny games and other computer programs.
🅾️ PandaJS - Open Source HTML5 Engine.
🅾️ Phaser - free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
🅾️ PixiJS - is a newcomer HTML5 game renderer - first released in early 2013. A main appeal of the engine is its use of WebGL for faster performance. If WebGL isn't supported, the engine falls back to standard canvas.
🆓 PuzzleScript - open-source HTML5 puzzle game engine.
🅾️ PyGame - a 2D game engine in Python.
💲 RPGMaker - series of programs for the development of role-playing games.
🆓 Ren'Py - visual novel engine using the Python language in simplified form. It supports Windows, Mac OS X, Linux, Android and iOS
🆓 SDL - SDL is a cross-platform library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D.
🆓 SFML - Simple and Fast Multimedia Library.
🅾️ Solar2D - A Cross-Platform Mobile App Development for iOS and Android (corona).
🆓 Solarus a free and open-source Action-RPG (Zelda) game engine
🅾️ SpriteBuilder - Open Source Game Development Suite for MacOS
🆓 SpriteKit - SpriteKit code to make your game work on iOS, macOS, and tvOS without a hitch.
🅾️ Stage.js - Lightweight and fast 2D HTML5 rendering and layout engine for cross-platform game development.
🆓 Stencyl - a game creation platform that allows users to create 2D video games for computers, mobile devices, and the web.
🅾️ Tilengine - C Engine with wrappers for C#, Python and Java.
Tiny Computer - open source fantasy computer for making, playing and sharing tiny games.

3D Engines and Frameworks

🆓 Azul3D - A 3D engine written in Go.
🅾️ bgfx - Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
🅾️ Bevy - A data-driven game engine in the form of a Rust library.
🅾️ Bullet - Real-time physics simulation.
🅾️ Cinder - Cinder is a community-developed, free and open source library for professional-quality creative coding in C++.
🅾️ Dash - A free and open 3D game engine written in D.
🅾️ Diligent Engine - A modern cross-platform low-level graphics library that supports Direct3D11, Direct3D12, OpenGL/GLES, and Vulkan.
🆓 Evergine - The graphics development engine for business and industry. Build high-quality 3D solutions and deploy to any platform.
🅾️ 🚩 Flax Engine - multi-platform 3D game engine
🅾️ gameplay3d - 2D + 3D game framework written in C++
🅾️ Godot - An advanced, feature-packed, multi-platform 2D and 3D open-source game engine.
🅾️ Horde3D - small open source 3D rendering engine.
🅾️ Irrlicht - open source high performance realtime 3D engine written in C++.
🅾️ jMonkeyEngine 3 - a 3D open-source game engine for adventurous Java developers.
🆓 JPCT - jPCT is a 3D engine for desktop Java and Google's Android.
🅾️ Amazon Lumberyard - Amazon Lumberyard is a free AAA game engine deeply integrated
🅾️ ODE - ODE is an open source, high performance library for simulating rigid body dynamics.
🆓 Ogre3D - is a scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++.
🚩 OpenXRay - a community-modified X-Ray engine used in S.T.A.L.K.E.R. game series.
🅾️ Panda3D - a framework for 3D rendering and game development for Python and C++ programs.
🅾️ Piston - a modular open source game engine written in Rust.
🆓 PlayCanvas - A WebGL Game Engine with limited free
🅾️ Rajawali - Android OpenGL ES 2.0/3.0 Engine
🅾️ Raylib - A simple 2D and 3D graphics library, with bindings available in numerous programming languages.
🆓 Source Valve's Flagship engine
🆓 Spring - A powerful free cross-platform RTS engine.
💲 Stingray - 3D game engine and real-time rendering software
🆓 Superpowers - HTML5 Collaborative 2D/3D Game Maker
🅾️ Three.js - Javascript 3D Library.
🆓 Turbulenz - Turbulenz offers the ability to build, publish, iterate and monetise high-quality games that react like no others, with immersive 3D effects and real-time physics that open up a whole new world of unprecedented and extraordinary web content.
🆓 Unity 3D - A development engine for the creation of 2D and 3D games and interactive content.
🆓 Unreal Engine 4 - the new game engine technology developed by Epic Games.
🅾️ Urho3D - Cross-platform rendering and game engine.+
🅾️ WhiteStorm.js - 3d javacript framework for building apps and games
🆓 voxel.js - voxel.js is a collection of projects that make it easier than ever to create 3D voxel games like Minecraft all in the browser.
🅾️ Xenko Game Engine - open-source C# game engine designed for the future of gaming

Game Source Code

🅾️ BrowserQuest
🅾️ Diablo
🅾️ Doom 3
🅾️ Doom
🆓 Duke Nukem 3D: Atomic Edition
💲 HandmadeHero: making 2D game from scratch
🅾️ Prince of Persia
🅾️ Quake 2
🅾️ Quake III Arena
🅾️ Quake
🅾️ SimCity
🅾️ Wolfenstein 3D
🅾️ Delver

Modules and Additional API

🆓 AirConsole- Add controller support using broswer
🅾️ DotRecast - a port of Recast & Detour, navigation mesh toolset for games, Unity3D, servers, C#
🅾️ ecs-lib - ecs-lib is a tiny and easy to use ECS (Entity Component System) library for game programming. It's written in Typescript but you can use on node.js and web browser too.
🅾️ kitlang - Kit is a programming language designed for creating concise, high performance cross-platform applications.
🅾️ p2.js - JavaScript 2D physics library
🅾️ SimpleAI - C++ AI behaviour tree based library with a QT5 based remote debugger

Design

Idea Generators

🆓 Boardgamizer - Board Game Design Idea Generator.
🆓 Gigster Randomized Game Idea Generator
🆓 RPTools - a brand of open-source programs designed to enhance traditional pen-and-paper role playing games.
🆓 Video Game Name Generator Randomized video games names

Marketing and PR

🆓 Yunoia - Online Publishers/Marketing

Mechanics

🆓 Board Game Mechanics Set of different board game mechanics

Project Management

🚩 Asana - Free cloud project Management
🚩 Casual - Visual Project Management
🚩 ClickUp - One app to replace them all.
💲 Codecks - Project Management Tool inspired by Collectible Card Games
🚩 HacknPlan - Project management for game developers
🚩 Taiga - Project management platform for agile developers & designers
🚩 Trello - Organize and prioritize projects

Tools

Animation

💲 Fusion Character Animator - small tool for Clickteam Fusion 2.5 to facilitate the animation of 2D character sprites for developers.
🅾️ ScreenToGif - record a selected area of your screen and save it as a Gif
💲 Spine - Spine is dedicated to 2D animation, providing an efficient workflow both for creating amazing animation and for integrating it into your games.
🅾️ DragonBones - The Open Source 2D skeleton animation solution for Flash
🅾️ LWF - Lightweight SWF. LWF is an animation engine which can play animation data converted from FLASH contents in HTML5, Unity, Cocos2d-x, iOS UIKit, and more.

Audio Tools

🅾️ Ardour - A multichannel digital audio workstation
🅾️ Audacity - cross-platform software for recording and editing sounds.
🆓 BeepBox - online tool for sketching and sharing chiptune melodies
🆓 Bfxr - A tool to make sound effects for computer games.
🆓 Bosca Ceoil - Online (and also desktop) music producer made by Terry Cavanagh. Simple, intuitive, has a distinctive retro-ish sound.
🆓 ChipTone - Online sound effect generator
🆓 FamiTracker - Produce music for the NES/Famicom-systems
🆓 jfxr - A JavaScript port of the Bfxr sound effect generator.
🅾️ LMMS - digital audio workstation software
🆓 MadTracker - a powerful and efficient approach to making music. Versatility and compatibility are guaranteed due to full VST™, ASIO™ and ReWire™ support.
🅾️ Musagi - fairly large and sophisticated music editor and synthesizer
🆓 PulseBoy web-based musical sequencer which only uses 8bit sounds and samples
🅾️ Rosegarden - music composition and editing environmen
🅾️ Sekaiju - Open Source MIDI sequencer.
💲 Soundation - Online Professional music studio.
🆓 SunVox - a small, fast and powerful modular synthesizer with pattern-based sequencer (tracker).
🅾️ Unity-Audio-Manager - Plugin, that allows to easily play/change/stop/mute/... sounds in 2D/3D

Bitmap Compression

🆓 ImageAlpha — Mac OS X GUI for pngquant and other tools
🅾️ Image Asset Generation Photoshop plug-in — Easy export layers to files.
💲 Kraken.io - robust, ultra-fast image optimizer and compressor with best-in-class algorithms.
🆓 PNGGauntlet - Smash PNGs for faster sites
🆓 PNGoo - Windows GUI for batch conversion.
🅾️ Pngyu - simple PNG image file compression tool.
🆓 SuperPNG Photoshop plug-in — Mac and Windows. Comparison with "Save for Web"
🆓 TinyPNG - Advanced lossy compression for PNG images that preserves full alpha transparency.

Character Generators

🆓 Charas - Charas is a charset generator for RPG Maker.

Design Tools

💲 articy:draft visual environment for the creation and organization of game content.
🆓 Dundoc Game Design starter Template
💲 Scrivener Helps concentrate on composing and structuring long and difficult documents
🆓 Tiny Game Design Tool small, portable booklet created in order to help game designers.
🅾️ Twine - Open-source tool for telling interactive, nonlinear stories.

IDE and Editors

🅾️ Atom Highly customizable open source text editor
🆓 CodeLobster - free cross-platform integrated development environment
🆓 Eclipse - integrated development environment mainly used for Java
🅾️ Notepad++ Notepad replacement that supports several languages.
💲 Sublime Text Sophisticated text editor for code, markup and prose.
🆓 Visual Studio Code Free. Built on open source. Runs everywhere.
🆓 Visual Studio Community Edition A fully-featured, extensible, free IDE

Material

🅾️ Material Maker - Material Maker is a procedural materials authoring tool based on the Godot Engine.

Modeling

🅾️ Blender - free and open source 3D creation suite
🆓 ZBrush Mini digital sculpting software
💲 SketchUp - 3D modeling computer program for a wide range of drawing application
💲 Maya Industry animation software
💲 3ds Max Industry modeling software
🚩 Clara.io - Start creating, rendering and sharing 3D

Pixel Editor

💲 Aseprite - Animated sprite editor & pixel art tool
💲 Hexels - intuitive 2D, grid-based painting tool
💲 Pickle - Another Pixel art Editor.
🅾️ PiskelApp - Free Online Pixel Art and Animated Sprite Tool.
🆓 Pixa.Pics - Load any image on the web app as a pixel art. Then, draw, and eventually vectorize art.
🆓 Pixi Paint Desktop version of Pixie Engine
🆓 Pixie Engine - Free online pixel editor
🆓 Pixelicious - Image-to-Pixel Art converter
💲 Pixen - Pixel Art Editor for OSX (Warning: Pixen previously did not support custom gif palettes before becoming paid, and may still have this limiation.)
💲 PyxelEdit - Pixel art editor designed to make it fun and easy to make tilesets, levels and animations.

Spritesheet

🅾️ Cheetah-Texture-Packer - High efficient and fast 2D bin packing tool
🆓 GlueIT Free Simple Spritesheet Tool
🆓 Leshy SpriteSheet Tool - HTML5 tool for creating, packing, and modifying sprite sheets and texture atlases
🅾️ Libgdx Texture Packer - Texture Packer built into Libgdx
🆓 MakeAtlas - Simple tool to pack a texture atlas
🆓 ShoeBox - Adobe Air based app with game and ui related tools.
🚩 SpriteUV2 - tool for creating optimal meshes for textures/sprites and packing them into an atlas.
🅾️ Stitches An HTML5 sprite sheet generator
💲 TexturePacker - Great spritesheet creation editor.

Story Design

🆓 RapidQuest Free Branching Quest design tool

Terrain Generators

🆓 Canyon Terrain Editor - Create quality, realistic terrain quickly and intuitively
🆓 Fracplanet - Fractal planet and terrain generator
💲 World Machine - Procedural terrain creation, simulations of nature, and interactive editing

Texturing

💲 FilterForge - A plugin for Adobe Photoshop that allows you to build your own filters.
💲 PixPlant - Smart 3D texturing tool that creates high quality normal, displacement, specular maps and seamless textures from photos.

Tile/Level Editors

🅾️ OGMO Editor - generic level editor.
🆓 Mappy - Free tilemap editor.
🆓 Sprite Fusion - Free tilemap editor running in the browser, export your tilemaps as native Unity Packages and Godot Maps.
🆓 Tiled - free, easy to use and flexible tile map editor.

Vector/Image Editor

🅾️ Gimp - GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring.
🅾️ Krita - Sketching and painting, offering an end-to-end solution for creating digital painting files from scratch by masters.
🅾️ Inkscape - Inkscape is a free and open-source vector graphics editor for traditional Unix-compatible systems such as GNU/Linux, BSD derivatives and Illumos, as well as Windows and macOS.
🆓 Paint.NET - Paint.NET is free image and photo editing software for PCs that run Windows.
💲 Pixelmator - Full-featured image editing app for the Mac
💲 Affinity Designer - Professional graphic design software, easy to use and fast
💲 Affinity Photo - Professional photo editing software

Voxel Editors

🅾️ goxel - Open source 3D voxel editor
🅾️ VoxelShop- Open source for modify and create voxel objects

Bug Reporting

🚩 Instabug - Bug Reporting tool for Unity that enables beta users to send feedback in-app.

Tutorials

Game Development Tutorials

🆓 3D Game Shaders For Beginners - Step-by-step guide to real-time shading techniques.
🆓 Simple HTML5 Canvas Game - Simple HTML canvas RPG looking game
🆓 Udacity: HTML5 Game Development - HTML5 Game Development by Google