UCI chess engine
A promising chess program
Desktop/Android/HTML5/iOS Java game development framework
A free Chess program for Windows with a large set of features
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
A mapping tool for text-based games like text adventures, MUDs, etc.
MAME Android Emulator.
Easy fine console input/output for java
Open-DIS implements the IEEE DIS protocol in multiple languages.
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
2D physics engine for games
Develop an emulated Darkfall Online Server.
"Kenny" is an XBoard/WinBoard chess engine based on "Winglet"
Read and write PGN format and test moves for legality.