The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Software (1 member)
- ResearchOrganization (0 members)
- City (0 members)
- Recipe (0 members)
- Sample (1 member)
- WebService (0 members)
- IssueLabel (0 members)
- ExternalPerson (0 members)
- Article (3 members)
- Department (0 members)
- Region (0 members)
- TaskStatus (3 members)
- Requirement (0 members)
- EducationalOrganization (1 member)
- 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)
- DataTool (0 members)
- HowTo (1 member)
- Tool (3 members)
- Process (3 members)
- Device (1 member)
- StrictParticipantsProcess (1 member)
- OrganizationalSubUnit (4 members)
- Dataset (0 members)
- File (2 members)
- ObjectProperty (16 members)
- Property (6 members)
- QuantityProperty (2 members)
- Term (0 members)
- Thing (1 member)