0 A.D. is a free, open-source, cross-platform real-time strategy game.
Open source FPS/RTS Game
Lightweight Shaders for Intel HD Graphics - (Chocapic13' Shaders edit)
Pycraft is an open-source, OpenGL based game made in Python
A free 3D game engine to create games and realtimes scenes for Windows
High-efficiency minimalist C++ wrapper for OpenGL 4.3
An extensible GUI system for game development
2D Game Engine
3D-Accelerated open-source DOOM engine
Perl bindings to the Modern OpenGL API
Zombie survival on a city wide scale!
Java 2D graphics/utility library
Small OpenGL based game enegine
A simple tower defense game
Vehicle simulation with freedom of movement on large map (5x5km).
3D game engine for C and C++
A graphics engine + toolkit.