The Generic Universal Role-Playing System! Delightfully versatile, with supplements from horror to space to fantasy to superheroes and beyond... ...also home to the first magic system I threw my hat in on trying to figure out for awhile. Anyone else play/enjoy this rp system?
My husband does! He's got an entire shelf packed with GURPS supplements. I've been meaning to get into it, since it's flexible enough I could use it to run a game in one of my own worlds, but I haven't managed to find the wherewithall yet.