UCI chess engine
ChessMD is a Qt-based chess game viewer with engine analysis
Chess engine written in Pascal with an UCI interface.
Chess training program playing gambits
Chess Database and PGN viewer
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
The world's smallest chess playing program just got smaller!
Next generation web chess club