In the past few years, various groups have formed to support additional machines. The largest, not surprisingly, has been the Macintosh group, which finally got off the ground (after an apparent vaporware "effort" was dismissed as a hoax) in 1996. Now the Mac port is running stably with both 2.0 and 2.1 kernels.
The Amiga support code in Linux/m68k has also been adapted to work with Amigas using PowerPC processors.