– id Software, in keeping with tradition, has released the source code for the nearly six-year-old Quake III Arena. The source code can be compiled for Windows, Macintosh, and Linux; though it’s a freely available download, the code is still protected under the GPL license. The code for the Q3Radiant map editor is also included, and is subject to the same terms as the Q3A source.
Link: Gamasutra
