Alternity

Ad Astra: Tri-Stat DX
An Alternity universe campaign setting, featuring high concept science fiction and new material for use in the core setting or adaptable to other games.
http://www.angelfire.com/rpg2/ancientworlds/AstraDX.html

Alternity and Beyond
Ships, planets, and essays.
http://homepage.tinet.ie/~ournexus/compsec.htm

Big Ideas, Grand Vision
Rules and background for a hard-science campaign set in A.D. 2350.
http://www.nada.kth.se/~asa/Game/BigIdeas/

Fledgling Empire Campaign
Timeline, sector map, and planetary descriptions for a new campaign setting.
http://www.geocities.com/gentleweren/

Harvest Moon
Features campaigns based on TSR's "Bughunters" game and the television series "Cleopatra 2525".
http://www.harvestmoon.freeservers.com/

Li Po's Alternity Page
MS-DOS character and spaceship generation software.
http://www.pathguy.com/alter.htm

PBEM Alternity
Features rules for gaming in several fiction-inspired settings, including Middle Earth, Star Trek, and the anime "Dragon Ball Z".
http://www.geocities.com/scott_metz/alternity/

Uncle Jimbo's Bug Huntin' Range
Settings and concepts, including the Orthopteroid species, Nemesis Gate and Crucible campaign settings.
http://homepages.ihug.com.au/~jclunie/index.htm

Vatican Deception
Characters and adventure summary from a defunct online campaign.
http://www.angelfire.com/games/vaticandeception/

WebRing: alternity
Group of interlinked sites also known as "Alternity Web Ring".
http://www.webring.com/hub?ring=alternity