The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Entity Relationship Diagrams (1 member)
- Environments (1 member)
- Ephemera (1 member)
- Epub (2 members)
- Equipment (1 member)
- Ereaders (3 members)
- Errors (1 member)
- Escape (1 member)
- Events (2 members)
- Excel (1 member)
- Exhibitions (1 member)
- Exiftool (1 member)
- Exploration (3 members)
- Exploring (42 members)
- Exporting (2 members)
- Extensions (3 members)
- Externals (1 member)
- F-91W (1 member)
- FAT (1 member)
- FOSS (1 member)
- Facebook (4 members)
- Family (3 members)
- Family history (2 members)
- Fandom (1 member)
- Fanfic (1 member)
- Fantasy (1 member)
- Features (3 members)
- Federal Election 2007 (1 member)
- Feedback (1 member)
- Feeds (3 members)
- Ferries (1 member)
- Fiction (2 members)
- Figo's (1 member)
- Fileinfo (1 member)
- Filenames (1 member)
- Files (5 members)
- Filesystems (2 members)
- Filing (1 member)
- Firefox (2 members)
- Fixing (1 member)
- FlatCats (1 member)
- Flattening (1 member)
- Flickr (3 members)
- Focus (1 member)
- Food (2 members)
- Food Co-op (1 member)
- Food shortages (1 member)
- Foreign keys (1 member)
- Forms (1 member)
- Forums (1 member)