UCI chess engine
Chess training program playing gambits
ChessMD is a Qt-based chess game viewer with engine analysis
Chess engine written in Pascal with an UCI interface.
Chess Database and PGN viewer
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
A work-in-progress chess bot written in C#
NetChess to play between two players over net or internet
Chess program
Python chess engine
SJCE - free portable cross-platform graphical chess game, 100% Java.
The forever free, ad-free and open source chess server
EXCEL VBA chess engine with chess board
Extensive Java chess database libraries.
Chess Database application
Java Chess Engine
The world's smallest chess playing program just got smaller!