I'm using NullDC for Dreamcast. Not sure what version it is, but when I tried a more recent build, I couldn't get it working. (didn't invest much time in trying)
Dolphin is the only gamecube emulator that I'm aware of.
I've tinkered with it and it works well if you have a decent processor.
The games didn't interest me enough to incorporate it into Mala though.
If you have a 4 player panel, super smash bros & super mario party can be fun.