Phutura is another one of those VST synths that you can't believe is free. Inspired by the Alpha Juno hardware synth, You have 8 voices, 3 oscillators plus white noise, and your usual HPF/LPF, ADSR, chorus, and such. When you first fire it up, the default presets may trigger a severe onset of nostalgia if you were a 90s raver. Right off the bat, you get several different variations on the unearthly sound that artists such as Joey Beltram made famous. Most of the other presets are also pretty solid (basses, pads, leads), but...DAT HOOVER THO. Fa reals.
This thing sounds damned close to my MKS50 (alpha juno in a rack). The filter isn't quite as tasty, but its a pretty analog sounding filter emulation. Everything else is really close. All in all this guy is a worthwhile free download. One of the best vintage hardware emulations going at any price... right in there with TAL's U-no and U-He's Re-Pro.