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GURPS Supplements

Infinite Worlds Travel between alternate worlds and time!
Lands Out of Time Humans and Dinosaurs!
Reign of Steel: Will To Live Play in a world where the robots have taken over the world and humanity is barely surviving. You should have the Third Edition Reign of Steel to which this updates and adds material.
Tales of the Solar Patrol Space Opera in the Solar system.
Technomancer More commentary here
Transhuman Space Posthumanist setting with cyborgs, genetically engineered people and sentient computer programs. Originally for GURPS Third Edition it is compatible and has new material for GURPS Fourth Edition.
Uplift
War Against the Cthorr