ChessDB is a free open-source chess database for Windows, Linux, Mac OSX and most UNIX and UNIX-like operating systems. ChessDB is based on code from Scid http://scid.sourceforge.net/ - a project for which there have been no updates for several years. In
The project is an opengl 3d (3 level) chess game with an ai that plays against the user. It is written is C++ and uses tcl/tk. All of the code is nearly platform independent.