Campaign Settings

Dawn of Magic
TL2 world based on ancient Rome, the Third Reich and Tsarist Russia.
http://www.dawnofmagic.net

Discworld Roleplaying Game
Roleplaying with the world and characters of Terry Pratchett.
http://www.sjgames.com/gurps/books/Discworld/

DM's GURPS Page
Adventures and campaign settings for GURPS, including additional material for Transhuman Space.
http://www.dangermouse.net/gurps/

Eric's GURPS Resources
Elfword, Supers and World of Darkness conversions for GURPS.
http://www.finestead.com/GURPS/index.html

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.
http://members.lycos.co.uk/NickTyrrell/Ethal_frames.htm

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.
http://www.geocities.com/zattsplace/

GURPS & RPGs
Contains past campaign stories.
http://bobby.queerlydigital.com/roleplaying.html

GURPS WWII
Second World War roleplaying game by Gene Seabolt.
http://www.sjgames.com/gurps/books/ww2/

Hellboy Sourcebook and Roleplaying Game
Game based on the Mike Mignola comics.
http://www.sjgames.com/hellboy/

HJO3
Steampunk and modern Greek mythology settings and some characters for Transhuman Space.
http://www.hjo3.net/gurps/

IMC - Interstellar Mercenary Corps
A TL9 military/sci-fi campaign world for GURPS.
http://www.fortunecity.com/underworld/escape/48/index.html

Saromatia
A fantasy setting featuring a benevolent matriarchy.
http://www.geocities.com/sca_bard/World/Saromatia/saromatiaindex.html

Transhuman Space
Roleplaying game set in a future of genetic engineering, artificial intelligence, and nanotechnology by David Pulver.
http://www.sjgames.com/gurps/transhuman/

Transhuman Space Templates
Character templates converted to GURPS 4th edition.
http://members.cox.net/justjessie/Transhuman_Space/THS_Conversion_Guide.html

Victorian GURPS
Numerous resources for playing GURPS in a Victorian-era setting. Includes gameworld description, adventure seeds, sample characters, and some house rules.
http://codepoet.org/~markw/gurps