Gateway: Alternate Worlds – Looks at what global society would be like if history had happened differently, with three suggested timelines, reviews of alternate history novels, and links to related sites.
The Locus Index to Science Fiction – Bibliographical database of novels and short stories published after 1983. From the US trade journal for the genre.
Lunacat.net – SFF books written by women. Broken down by author and type of story.
Religion in SF/F Literature – Includes c. 2000 references to real churches, religions, and tribes in science fiction novels and short stories.
Steampunk – Portal for SFF – includes links to author websites, and direct links to online texts.
Transformation Stories List – Books and stories with shapeshifting (werewolves, and nanotechnology) as a theme. Searchable, with brief descriptions and reviews.