UCI chess engine
Sandbox video game with a powerful physics engine
ZeroMQ core engine in C++, implements ZMTP/3.1
Chess training program playing gambits
Chess Database and PGN viewer
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
NetChess to play between two players over net or internet
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
A collection of patches for the upstream Scid vs PC project.
Chess program
Ultra-fast matching engine written in Java based on LMAX Disruptor
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.