The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Appendix (3 members)
- Article management templates (3 members)
- Article stubs (2 members)
- Book five (1 member)
- Book of Nimbus (33 members)
- Book one (0 members)
- Book three (0 members)
- Browse (4 members)
- Buildings (4 members)
- Candidates for deletion (8 members)
- Candidates for speedy deletion (0 members)
- Category templates (3 members)
- Community (5 members)
- Content (1 member)
- Copyright (1 member)
- Disambiguations (0 members)
- Emoticons (0 members)
- Forums (6 members)
- General wiki templates (24 members)
- Help (6 members)
- Help desk (2 members)
- Hidden categories (1 member)
- Image wiki templates (9 members)
- Images (2 members)
- NEC (26 members)
- NS Community (3 members)
- Netstorm (4 members)
- Organisation (8 members)
- Pages proposed for deletion (0 members)
- Pages with broken file links (0 members)
- Policy (3 members)
- Rain (12 members)
- Screenshots (0 members)
- Site administration (5 members)
- Site maintenance (3 members)
- Spells (17 members)
- Sun (11 members)
- Templates (6 members)
- Thunder (9 members)
- Units (56 members)
- Walkthroughs (11 members)
- Watercooler (2 members)
- Wind (10 members)