- jack/alsa
- ardour
- seq24
- jackrack (ladspa)
- amsynth
- specimen
- lash (will be a poor performance yet ;)
what else?
well, ZynAddSubFx always sounds so smoothe and it looks good, too. and
on that note, Hydrogen if your machine has the muscle.
and freqtweak. that thing is awesome and truely a la origional. (or at
least i've never seen a win32 equivalent)