I just read about a Belgian-German company that ports games to amiga, linux and mac...
some experts here maybe can check it out if they're interested..I've only read about it, not more...., but maybe it is interesting( It was also placed on linuxBelgium)

http://www.hyperion-entertainment.com/

They ported Shogo and Sin, and were going to port Tzar, but Linux users shot that one down. They have a deal to port games like Midnight Racing or whatever it's called, but a lot of Linux users don't want that either. I'm surprised they haven't given up entirely.