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)
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- History (3 members)
- Holidays (3 members)
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- 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)
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- Leech-Philosophy (1 member)
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- Linux (473 members)
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- Literature (64 members)
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- Lyrics (27 members)
- Mac (8 members)
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- Math (37 members)
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- Mattis Tagesseitensatz 01 (2 members)
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- MySQL (1 member)
- Mystery (5 members)
- Mysticism (1 member)
- Mythology (3 members)
- NASA (4 members)
- Nagios (10 members)
- Nature (1 member)
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- News (15 members)
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- Numbers (1 member)
- Numerology (20 members)
- One big soup (13 members)
- Open Source (1 member)
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- Organisations (1 member)
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- Pages using duplicate arguments in template calls (1 member)
- Pages with broken file links (8 members)
- Pages with template loops (68 members)
- Paradigm Shift (153 members)
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- Performance Art (3 members)
- Perl (17 members)
- Philosophie (3 members)
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- Pictures (37 members)