Yep, title says it all. It's free until November 15. The other SoundToys plugin I have (Little Plate -- plate reverb) is simply amazing... and I LOVE their UIs as well!
I picked up their LIttle Plate reverb plugin for free in a similar BF giveway a few years ago. It rocks.
No doubt that this will too.
Checking it out now
Also free right now is a Bricasti M7 emulation -- really nice from the little I've tried it so far.
It's called "Magic 7", available for download from Wave Alchemy: