> It never really worked, except on the most basic of command line Tools
> (and, in theory) some very lucky apps that used OS3.9 ReAction [...]).

My most notable uses of OS4Emu that I remember were:

- FPSE (until MorphOS-native version emerged in 2008)
- MilkyTracker (until MorphOS-native version emerged in 2008)
- RAGEMEM
- iffanimplay
- cdplayer.library (for running Napalm until MorphOS-native version emerged in 2012, though m68k version reportedly worked as well)

In that thread, some more uses are mentioned by others.