There are so many good GURPS books out there. A short list:
- GURPS Classic Voodoo
- GURPS Classic Traveler Starports
- GURPS Classic Cabal
- GURPS Classic Space Atlas 4
- GURPS Classic Cops
- GURPS Classic Religion
- GURPS Thaumatology
- GUPRS Thaumatology Magical Styles
- GURPS Powers The Weird
- GURPS Power Ups 6 Quirks
- GURPS Thaumatology Ritual Path Magic
Plus pretty much the whole DF & MH lines. DF has been wonderful for my fantasy game and I'm now running a MH game.
I'd still have to say that Starports is one of my favorite all time supplements. I've used bits and pieces of it in almost every science fiction game I've run since it came out.
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Seven Kingdoms, MH (as yet unnamed), and my "pick-up" DF game war stories, characters, and other ruminations can be found
here.