The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 23 (11 members)
- 3D (5 members)
- ? (12 members)
- AI (7 members)
- ASCII (57 members)
- Acronyms (3 members)
- Agriculture (6 members)
- Aliens (8 members)
- Alphabet (8 members)
- Anarchism (20 members)
- Anatomy (7 members)
- Animals (13 members)
- Antifa (4 members)
- Apache (4 members)
- Arduino (6 members)
- Art (56 members)
- Articles For Deletion (1 member)
- Artists (22 members)
- Ascii (3 members)
- Astronomy (29 members)
- Audio (7 members)
- Authors (26 members)
- Autonomy (3 members)
- BSD (1 member)
- Bands (58 members)
- Bash (3 members)
- Biology (8 members)
- Bleeding Edge (2 members)
- Blinkenlights (29 members)
- Blinkensisters (7 members)
- Blog (1 member)
- Blogs (4 members)
- Body (1 member)
- Books (50 members)
- Bots (62 members)
- Boxes (45 members)
- Broken jargon pages (1 member)
- Buddhism (6 members)
- Buggy jargon pages (1 member)
- Bush (3 members)
- CC-BY-2.0 (2 members)
- CC-BY-NC-ND-2.0 (1 member)
- CC-BY-SA-2.0 (1 member)
- CC-BY-SA-2.5 (5 members)
- CC-by-sa-Bild (1 member)
- CCC (23 members)
- CIA (1 member)
- Cats (2 members)
- Censorship (4 members)
- Chemistry (1 member)