UCI chess engine
Chess Database and PGN viewer
A promising chess program
Chess program
a UCI chess engine
Chess program
SJCE - free portable cross-platform graphical chess game, 100% Java.
A console/ncurses chess engine frontend and PGN editor.
icsdrone is an interface between a chess server and a chess engine
OpenGL chess game
A powerful chess engine written in C++
A Java chess engine using xboard protocol
xBoard is a lightweight forum, news, and chat script.
"Kenny" is an XBoard/WinBoard chess engine based on "Winglet"