From the announcement:
Today we are excited to release the final ruleset in our series of system-agnostic games: WarStuff.
WarStuff is a skirmish wargame that you can play with anything you like. It was designed with pick-up games and conventions in mind, where players might have miniatures from very different collections and usually wouldn’t be able to play together, but with WarStuff they can!
The game can be played with any miniatures, and actually with even more than miniatures. You can have space nazis fight plastic dinosaurs, superman battle against space marines, or even just see your candy-bars duke it out, anything goes!
We hope you enjoy our craziest release thus far, Happy Wargaming!