> I was trying to run some demos lately and to my suprise none work.

Most m68k Amiga demos (and games) hit the OCS/ECS/AGA chipset.

> is there a comprehensive list of what 68k software run natively on MorphOS?

There have been some old threads:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7831&forum=16
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=5848&forum=9