When adding a setting to the Wiki, feel free to use as many pages as you need. There is one caveat to this, to avoid many pages competing for the same page name, please apply a prefix or suffix to every page after the main page for the setting. See how the Near entry is constructed for an example on how this is meant to work.

Sci-Fi

7 Suns	Created because THS doesn't have FTL.
GURPS Halo	An ongoing attempt to create a GURPS 4th setting for Halo.
GURPS Space Opera	Mukaikubo discovered GURPS:Space and got a little crazy and started making a setting with aliens and solar systems and stuff.
GURPS Trek	Star Trek in GURPS 4th.
Interstellar Traders	Traveller; with more aliens, better ships and more fighting.
D6 Mass Effect	Bass Concert Hall's ongoing port of Mass Effect into the Star Wars D6 ruleset.
Mission to Mars	GURPS 4th Edition, Humanity on the brink of TL9 and Mars colonization.
Strangers in Strange Space	GURPS 4th Edition, space opera sequel to Mission to Mars.
Solar Conflict	GURPS Space 4th Edition, the solar system is on the brink of war.
Space Pirates	DtD 40K 7e, a combination of Planescape, 40K, Exalted and a host of other games.

Fantasy

Cave of Danger	Cave of Danger is the Random Dungeon setting generated by aldantefax for Dungeons and Dragons, 4th Edition.
Cold and Dirty War	An original setting created by falcon2424. d20, High magic, Victorian level technology.
Dragaera	Dragaera is a world created by author Stephen Brust. It is a world of sorcery, witchcraft, and intrigue. Rules based on the d20 system.
Fourth Age	Ontological Zombie's organically growing setting used as a showcase for his 1e Dungeons and Dragons to GURPS conversion project.
GURPS ADOM	A conversion of the ADOM setting to GURPS
HorsePower	A mashup world of Vikings, Greek Myth, Arthurian Legend, traditional fantasy, and anything else that seems cool.
Kobolds Ate My Baby (TG Edition)	An updated, expanded setting for KAMB with more bonuses, more bogies, more babies and more hailing of King Torg (ALL HAIL KING TORG!).
Marpocalypse	A world set in a post-apocalyptic Mushroom Kingdom. Bowser rules, Luigi is dead, and Mario leads the resistance in the wake of the big bobomb.
MonMarro	Phrog's homebrew Dungeons and Dragons setting: a blasted, alien place at the utter edge of the multiverse bordering the Far Realm itself.
Near	A pulpy, romantic, post-apocalyptic fantasy world that is the included setting in The Shadow of Yesterday, an indie-rpg from Anvilwerks, and uses the Solar System rules. The Shadow of Yesterday is released under the Creative Commons license.
Ravenloft	50 Foot Ant's take on Christianity in Ravenloft.
Refuge	An original steampunk campaign setting.
Relic	Actually still just some rough ideas for messing around in D&D that is starting to turn into a thing.
Renvin (Steampunk)	A steampunk fantasy ran without a GM.
Rueda	Jonked's homebrew fantasy setting, involving elements from the Greyhawk setting.
Sumianon	A medieval world filled with mythological creatures.
The Wal	Red_Mage's Department locked societal setting.
Wraith	An 'old' World of Darkness setting and system centering on ghosts and the odd limbo-afterlife they live in.
Zenith	Zenith is a fantasy campaign setting that takes place on a spin-locked world, with one half of the world in unending day, the other in undying night.

Modern

Blackbird Dreaming	Post Apocalyptic Survival Horror using GURPS 4th Edition.
Blackwatch	Dresden Files-esque mystery-horror game ran by ConfusedUs.
Change the World	Bloodnose's multimedia setting based in part on Sid Meier's Civilization.
Heart of Darkness	ManMythLegend's Savage Worlds action/horror game set during a third civil war in the Congo.
Madness Dossier	Jonked's expansion on the campaign blurb in GURPS Horror.
Slipping into Dreamland	Strange happenings at a warehouse
The City	Supernatural/Fantasy Cyberpunk game using Truth & Justice.
Warehouse 23	Doc Bubonic's GURPS Warehouse 23 setting.
Welcome to the Island	Over the Edge setting by Doc Bubonic
X-Com	A Savage Worlds conversion of the classic PC game by ManMythLegend.