The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- German (224 members)
- Gods (12 members)
- Google (8 members)
- Graffiti (1 member)
- Graphics (10 members)
- Groups (45 members)
- HTML (4 members)
- Hacking (97 members)
- Hardware (52 members)
- History (3 members)
- Holidays (3 members)
- Holydays (9 members)
- HowTo (64 members)
- Human (6 members)
- Humor (3 members)
- IRC (102 members)
- Illuminati (27 members)
- Illusions (1 member)
- Images (3 members)
- Initialisms (3 members)
- Intelligence (1 member)
- Internal (120 members)
- Internet (2 members)
- Internet History (6 members)
- Internet Protocol (1 member)
- Iraq (2 members)
- Isms (21 members)
- Jargon (48 members)
- Jargon File 4.0.0 entry (0 members)
- Jargon File 4.4.7 entry (0 members)
- Java (3 members)
- Kunda (49 members)
- Köln (8 members)
- Laconica (1 member)
- Lain (3 members)
- Language (1 member)
- Languages (1 member)
- Leech-Philosophy (1 member)
- Licenses (17 members)
- Linguistics (5 members)
- Link templates (1 member)
- Linux (473 members)
- Linux Distributions (41 members)
- Literature (64 members)
- Locations (41 members)
- Lyrics (27 members)
- Mac (8 members)
- Magazines (5 members)
- Manpages (260 members)
- Marketing (2 members)