Runescape 2007 / oldschool client with many features.
Educational framework for OpenGLES, OpenCL and OpenAL
Northern Lights is an interactive novel.
C++ game libraries plus server.
RPGDS is a dice simulator for coin and polyhedron dice.
Java Game Engine
Modular Gaming Open Source Persistent Browser Based Game Framework
The original Xivio.com World Server Core
Invading aliens type game using SDL
AssaultCube is a FREE, multiplayer, first-person shooter game.
A set of Forge mods for Minecraft. (API, Stargate, custom signs...)
Source for the Flash-based Glitch client
Items, Inhabitants, and other Glitch game assets
Art and source for Glitch's customizable avatars
Complete, Fast, Accurate, Game Boy/CGB/SGB Emulator.
A truly extensible cross-platform game engine
A 2D Elite-style game written in Python 3.2.
A turn-based strategy game in the spirit of Tactics Ogre
A tiny "guess what I'm thinking about" game, or an identifier.