Chess Database and PGN viewer
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
The forever free, ad-free and open source chess server
Chess Database application
Extensive Java chess database libraries.
Simple OpenSource scoreboard
Chess engine, currently in development
A powerful chess engine written in C++
A Java chess engine using xboard protocol
A chess engine in C# using bitboards
JavaScript chess with board rotation, pgn output, forward/back & save