Kuro5hin Assembly program by David Horne, which is run on the ZX81 with just 1k of memory. http://www.kuro5hin.org/story/2001/8/10/12620/2164 Kuro5hin.org~Site InfoWhoisTrace RouteRBL Check
Ghost Ghost by Philipp Claßen. Ghost is an amateur chess program written in C++. Runs on Windows and Linux. http://www.ghostchess.de/ Ghostchess.de~Site InfoWhoisTrace RouteRBL Check
ChessWorks Multiplayer chess game that is playable over the internet or a LAN. [Macintosh/Windows] http://www.ekimsw.com/chessworks/ Ekimsw.com~Site InfoWhoisTrace RouteRBL Check