UCI chess engine
Portable UCI- and XBoard-compatible chess engines.
Scripts and tools for building and testing chess engines.
RelaxChess, chess game that makes no search futher needed for a wow
Extensive Java chess database libraries.
The world's smallest chess playing program just got smaller!
Chess engine, currently in development
A powerful chess engine written in C++
A Java chess engine using xboard protocol
A chess engine in C# using bitboards
Version 1.2
Yet Another Chess ENgine
"Kenny" is an XBoard/WinBoard chess engine based on "Winglet"
Anni is on free open-source C# UCI bitboard chess engine
An xboard-like Java application