The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Article (1 member)
- Department (0 members)
- Region (0 members)
- TaskStatus (3 members)
- Requirement (0 members)
- EducationalOrganization (1 member)
- OeoTerm (0 members)
- Faculty (0 members)
- DefinedTerm (5 members)
- State (0 members)
- RoomUsage (0 members)
- AreaUsageType (0 members)
- Project (0 members)
- Group (0 members)
- MonetaryGrant (0 members)
- Task (0 members)
- Room (0 members)
- IntangibleItem (4 members)
- NonGovernmentalOrganization (2 members)
- Enumeration (5 members)
- FundingCall (0 members)
- Foundation (0 members)
- MetaDeviceCategory (0 members)
- Association (0 members)
- User (0 members)
- HowTo (1 member)
- Tool (2 members)
- Process (3 members)
- MetaModel (0 members)
- Device (1 member)
- StrictParticipantsProcess (1 member)
- OrganizationalSubUnit (4 members)
- Dataset (1 member)
- File (2 members)
- Object <Object> (3 members)
- ObjectProperty (52 members)
- Page required for Actionable Extension (24 members)
- Pages with broken file links (1 member)
- Pages with math errors (2 members)
- Pages with math render errors (2 members)
- Pages with script errors (1 member)
- Pages with syntax highlighting errors (1 member)
- ProcessStepSubpageTemplate (5 members)
- Property (7 members)
- Property/Quantitative (26 members)
- QuantityProperty (29 members)
- Software <Software> (0 members)
- Term (215 members)
- Thing (3 members)
- Tool <Tool> (2 members)