Not fitting to your FPS list, but I think noteworthy and oldschool...
Still active Universal Binary download links (hope for 10.4, not just for 10.5):
-
MacBrickout
-
Neverball
Those could be a little more difficult to get:
- Airburst Extreme ->
http://www.strangeflavour.com/games/
- Jazz Jackrabbit 2 ->
https://www.jazz2online.com
- Pac the Man X, Bub & Bob X -> mcsebi - site unfortunately not available
Caution -> some dead or dangerous links on these sites (no warranty at all):
https://powerpcgaming.wordpress.com
https://macpowerpc.com/?s=games&submit=Search
Emulators can be found here, though it's not necessary to run them on a PPC since there are plenty of Intel emulators doing the same:
- Nintendo 64 -> sixtyforce 0.9.7 ( no download link for that version found on
http://sixtyforce.com )
- Multiple Arcade Machine Emulator MAME ->
http://mamedev.org ->
http://www.macmame.org
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- native Mac OS Classic (up to 10.4. and PPC G4, G5s not supported)
- Classic Environment (till 10.4 only PPC including G5) dumped with 10.5 (or earlier if on Intel)
- Mac 68k emulator was running under Classic (native and in Classic Environment)
- Rosetta (until 10.6. on Intel) for running PPC-Code dumped with 10.7