Nobody has mentioned basic 64, although I think that's at the woolys site. It's one of my favorites. 4 waveforms with 3 OSC and 2 LFOs. It also has a wobble effect (not like dubstep) where the pitch is slightly and randomly put out of tune, like a bad tape or something. I think the developer is De La Mancha and it can be found at the KVR audio site
I like Basic 64..