GLQuake is responsible for almost every unofficial modern source port. With the edits made to the game, they carefully corrected many of the issues found in the original DOS version, which was known to have some framerate stuttering, albeit not to the point that would make the game unplayable.
It was created as a test for Quake 2's hardware support. It was officially made by Id Software, but is not supported by them. GLQuake is a source port of Quake that uses the OpenGL graphics library, and was released on January 22, 1997.
