Alternate Histories - What if the events in all those science fiction movies really did take place? When did they happen? This site will tell you when.
Alternate History Discussion - The largest alternate history discussion forum on the web, plus a directory of individual scenarios sorted by era.
Alternate History Travel Guides - Over 25 Travel Guides, one pocket guide, and one Interdimensional Brewpub Tour, four worlds and counting.
B-49 Alternate History - Speculates on how military aviation history would have been different if the project had not been cancelled.
Changing The Times - An electronic magazine comprising of news, opinions, services and features.
Dale Cozort's Alternate History Page - "I do four things in this section: 1.Point to some good but obscure alternate histories. 2.Give links to a few good alternate history sites. 3.Hype my alternate history stories. 4.Toss out a couple of "alternate history scenarios of the month" for email discussion. "
Shattered World - An extremely detailed World War 2 alternate history, with its own discussion board.
Sideways - An anthology web comic strip that focuses on alternate history/reality. Also provides a showcase for alternate history stories.
Surreal History - Includes CSA Today, Balkanized North America and Moslem Australia.
This Day in Alternate History - A daily calendar with at least one alternate history scenario per day. Input on the scenarios or suggestions for new scenarios welcome.
Today In Alternate History - Weblog that features important events in history that never occurred today. Created by Robbie Taylor of College Station, Texas.
Uchronia: The Alternate History List - An annotated bibliography of novels, stories, essays and other material involving the 'what ifs' of history.
The Uchronìcles - Counterfactual literature, Nero Italiano and Chaos Goddess, including Today in History and a weblog.
Union Lost - Features two alternate history scenarios.
Von Braun Dreams - Alternative history discussion about the development of rocketry.
What If Gordon Banks had Played? - A British alternate history timeline, resulting from a different result in a 1970 football match, but leading to totalitarianism and war.