UCI chess engine
Xash3D FWGS engine
Desktop/Android/HTML5/iOS Java game development framework
The game engine for everyone
The source code to VVVVVV
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
GemRB is a portable open-source implementation of the Infinity Engine
Domination is a game that is a bit like the board game Risk
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
Platform independent browser based Str8ts solver
Platform independent browser based Sudoku solver
Some humble web applications
Orx: Portable Game Engine
A Endless running game set in desert filled with obstacles
JavaScript framework to build game engines, games, emulators and apps
PyMancala: A Python API for the Mancala game
Free and open source Avatar Webgame made by Vietnam
Create tennis tournament schedule
ZED OS the clone of Windows XP
2D Game Engine
Children's learning programming language Karel the Robot in 3D
Website to host funny pictures, movies etc.