UCI chess engine
A GNU/Linux operating system accessible for visually impaired.
Free database of copyright-free Chess books
Viking chess (tablut) game with CPU player
Solve Go problems (based on GoGrinder GoGrinder.sf.net )
World largest chess database
Two projects in one so far: to learn foreign words and read books
A chess game written is turbo pascal
A java-based, purely object-oriented chess engine.
Chess game interface
Read and write PGN format and test moves for legality.
chess library in java, PGN, FEN, ICS
Great chess clone, tough to read