The reqs for the first GTA are below. I think it would run. But I don't know if it's open source, although it is on MANY platforms, and there are lots of sites on it. Not sure, wish i did know.

Minimum Specification
75 MHz Pentium or Equivelent
16 Mb of RAM
1MB VESA compatible SVGA graphics card
DOS 6.0, Windows 95, Windows 98
80 MB of Hard Disk Space
Sound Card
Keyboard