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)
MAME Android Emulator.
Easy fine console input/output for java
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
2D physics engine for games
Develop an emulated Darkfall Online Server.
Read and write PGN format and test moves for legality.