The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Article management templates (1 member)
- Article stubs (33 members)
- Blog posts (0 members)
- Browse (4 members)
- Bugs and Glitches (1 member)
- Candidates for deletion (0 members)
- Celestial Bodies (6 members)
- Community (8 members)
- Disambiguations (0 members)
- Electrical (41 members)
- Help (0 members)
- Images (0 members)
- Indexed pages (3 members)
- Logic (22 members)
- Mechanics (10 members)
- Misc (1 member)
- Pages using DynamicPageList (2 members)
- Pages with broken file links (3 members)
- Pages with script errors (1 member)
- Pages with short description (1 member)
- Parts (227 members)
- Planets (9 members)
- Propulsion (7 members)
- Removed Parts (11 members)
- Resources (43 members)
- Template documentation (0 members)
- Templates (6 members)
- Tools (9 members)
- Tutorials (15 members)
- Updates / Events (3 members)
- Weapons (14 members)