Dawn of Magic
TL2 world based on ancient Rome, the Third Reich and Tsarist Russia.
Discworld Roleplaying Game
Roleplaying with the world and characters of Terry Pratchett.
Eric's GURPS Resources
Elfword, Supers and World of Darkness conversions for GURPS.
Ethaliel
A traditional fantasy world for GURPS Fantasy. The site has a collection of characters, some artwork, a diary of the players adventures, as well as maps of towns and villages, and other play aids.
GURPS Victorian Superheroes
A world setting and characters set in the late 1800s, after alien spores cause mutations world wide.
Hellboy Sourcebook and Roleplaying Game
Game based on the Mike Mignola comics.
HJO3
Steampunk and modern Greek mythology settings and some characters for Transhuman Space.
IMC - Interstellar Mercenary Corps
A TL9 military/sci-fi campaign world for GURPS.
Mook's GURPS Campaigns
Characters, sessions and writeups of Cyberpunk/Voodoo and Fantasy campaigns.
Narth 2000
Bob Schroeck's long-running steam-age fantasy campaign, with everything from cosmology to monetary systems defined.
Northenden
A low fantasy campaign based loosely on Harn.
Saromatia
A fantasy setting featuring a benevolent matriarchy.
The Amber Nebula
A TL10 space-adventure setting for GURPS with a mix of space opera and hard-SF overtones.
The Everdarke Saga
A high-fantasy world with house rules, characters, and monsters. Both an online "worldbook" and a campaign site for the Everdarke group.
Transhuman Space
Roleplaying game set in a future of genetic engineering, artificial intelligence, and nanotechnology by David Pulver.
Transhuman Space Templates
Character templates converted to GURPS 4th edition.
Victorian GURPS
Numerous resources for playing GURPS in a Victorian-era setting. Includes gameworld description, adventure seeds, sample characters, and some house rules.