Pulsor Suite contains a couple of Max for Live virtual instruments: Pulsor and Pulsor 2. With them you can create amazing soundscapes, resonant lead synths, evolutive basses, unorthodox percussive sounds, rhythmic textures, distorted noises and endless variations of the weirdest and uncharted sounds you can imagine.
What kind of plug-in is it?
They are Max for Live devices: to run Pulsor and Pulsor 2 you need Live 9 and Max for Live.
Is it Mac/Windows compatible?
Yes, it is compatible with both Mac and Windows (provided you have Ableton Live and Max for Live installed on your computer).