UCI chess engine
Chess training program playing gambits
Chess Database and PGN viewer
ChessMD is a Qt-based chess game viewer with engine analysis
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
NetChess to play between two players over net or internet
Chess program
SJCE - free portable cross-platform graphical chess game, 100% Java.
Python chess engine
The forever free, ad-free and open source chess server
EXCEL VBA chess engine with chess board
Chess Database application
Extensive Java chess database libraries.
Java Chess Engine
Simple OpenSource scoreboard
The world's smallest chess playing program just got smaller!
A collection of all maps and games made for the TripleA game engine