Fluid by Tubeohm, is free only on the german site Plugindex (version 1.5 is commercial).
6 notes polysynth, it sounds original, rather smooth, fluid, as its name says, and is made
for pads and ambient sounds. 3 DCO-Oscillator/Sampler per voice (99 samples), 2 DCF multimode
filters, 5 ADBR envelopes, 3 Lfo, effects (chorus, delay, reverb, ring modulator) and so on...
Rather rich engine, coming with good samples that give really interesting sounds.
Download Fluid here