UCI chess engine
Chess training program playing gambits
Batch tools for creating Polyglot books and PGN-based statistics.
Chess engine written in Pascal with an UCI interface.
ChessMD is a Qt-based chess game viewer with engine analysis
Chess Database and PGN viewer
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
NetChess to play between two players over net or internet
a UCI chess engine
Chess program
Collection of board games.
SJCE - free portable cross-platform graphical chess game, 100% Java.
Python chess engine
Chess Database Application
A console/ncurses chess engine frontend and PGN editor.
The forever free, ad-free and open source chess server
A JavaScript game library to quickly develop board games for the web