Once upon a time many years ago we released two strategy games for the Mac. Those games can be downloaded here. They should still work on any Mac that will run PPC code. It seems to run fine on an Intel iMac running 10.6.4. I didn't do a lot of testing - *note* networking doesn't work - sorry!
Please feel free to download and play these games (if they work!). However they are entirely unsupported. Registration details are on the download page.