Mac users interested in Ur-quan masters generally download:
A port of The Ur-Quan Masters, using SDL, targetted for Linux, all BSD, Windows, MacOS X, and other SDL-supported platforms. The project started in August 2002, when Toys For Bob released the partially ported sources of Star Control 2 3DO version to the fan community.
Additional suggestions for Ur-quan masters by our robot:
The Ur-Quan Masters HD is a remake of Star Control 2 game for Mac.
Ur-Quan...difficult to master