The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Article management templates (3 members)
- Article stubs (159 members)
- Assembler (5 members)
- Astronomical Objects (3 members)
- Audio templates (1 member)
- Building (70 members)
- Candidates for Cleanup (0 members)
- Candidates for cleanup (0 members)
- Candidates for deletion (7 members)
- Category Transclusion Pages (11 members)
- Category namespace templates (2 members)
- Chemical Facility (2 members)
- Citation templates (2 members)
- Combat Unit (1 member)
- Component (21 members)
- Components (77 members)
- Crafting Material (79 members)
- DPL templates (7 members)
- Dark Fog (1 member)
- Disambiguation (1 member)