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
World Foundry is a 3D level game engine and asset production pathway with over 170,000 lines of code. Originally a commercial product, now released under the GPL. Designed from the beginning to be cross-platform, runs on windows, working on linux port.
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.
SPT is a 3D application wich allows user to driving Polish trains. Project based on Marcin Wozniak's & McZapkie code. SPT contains powerful world editor.