MIT Science Fiction Society
- Site includes information on the Society's library (including e-texts), meeting minutes and activities reports, as well as a description of membership benefits and links to sci-fi sites.
- http://web.mit.edu/mitsfs/

Delphi's SF Literature Forum
- A Delphi Forums community of science fiction and fantasy readers and writers. Home of the Wednesday Night Irregulars chat, a Delphi fixture since 1985.
- http://www.sflit.com

The Speculative Literature Foundation
- Working to promote literary quality in speculative fiction. Site has frequently asked questions, news, resources, and information on their programs and grants.
- http://www.speculativeliterature.com/

Broad Universe
- Advocates of science fiction written by females.
- http://www.broaduniverse.org/

Science Fiction Foundation
- UK association of writers, academics, critics and others with an active interest in science fiction. Information about the research library in Liverpool, the review journal Foundation, and current activities.
- http://www.sf-foundation.org/

Point Of Divergence
- Alternate-History association. Contains a forum for discussion of ideas, and a story workshop for alternate history writers.
- http://www.marmotgraphics.com/pod/index.html

Black Scifi Horror Fantasy Club
- Black scifi, horror, and fantasy online club.
- http://groups.yahoo.com/group/blackscifihorrorfantasyclub/