UCI chess engine
Portable UCI- and XBoard-compatible chess engines.
Prebuilt UCI- and XBoard-compatible chess engines.
Chess Cheats for Personal use
Scripts and tools for building and testing chess engines.
A promising chess program
Blind Chess using Taiwan rule
Logical game
A JavaScript game library to quickly develop board games for the web
RelaxChess, chess game that makes no search futher needed for a wow
0xBench derivative
A simple chess board for Android (>= API 3)