Just a simple color picker, but more precise! I've done it mainly for fun and because I wanted a color picker with keyboard support to pixel perfect select a color without messing with the numbers.
sudo apt update && sudo apt install build-essential git \
libasound2-dev libx11-dev libxrandr-dev libxi-dev \
libgl1-mesa-dev libglu1-mesa-dev libxcursor-dev \
libxinerama-dev libwayland-dev libxkbcommon-dev
Follow steps 1, 2, 3: https://github.com/raysan5/raylib/wiki/Working-on-Windows#manual-setup-with-w64devkit