Emulation.net has all sorts of information about Mac-on-Mac emulators, though it's down when I checked (not sure if permanently or temporarily--haven't been there in a while). However, I found what looks like a mirror at emulation.victoly.com; here's the page you want:
http://emulation.victoly.com/macintosh/
I have, in the past, run several of the emulators from there to get old System 6 or 7 games running in X, and they work well enough.
You may also be able to find some info at the Mac abandonware games site Macintosh Garden:
http://mac.the-underdogs.org/
Actually, I found this amusing: I can download an ENTIRE System 6 system disk image, OS and all, in under 2 seconds, and on a G5 that system (running under an emulator, of course) boots so fast it's effectively instantaneous. Amazing how little the hardware of today thinks of the software of yesteryear.