The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Software engineering (1 member)
- Sol-R (1 member)
- Sorting (2 members)
- Sources (1 member)
- South Beach (1 member)
- Soylent (1 member)
- Spain (2 members)
- Spearwood (1 member)
- Speed (6 members)
- Speed of response (1 member)
- Spivak pronouns (1 member)
- Squirrelmail (1 member)
- St Johns Church (1 member)
- Stack Overflow (1 member)
- Static web pages (1 member)
- Stations (1 member)
- Status updates (33 members)
- Stones (1 member)
- Stonewaves (1 member)
- Storage (7 members)
- Stories (1 member)
- Strings (1 member)
- Suburbia (1 member)
- Subversion (3 members)
- Surveillance (1 member)
- Surveys (2 members)
- Susan Cain (1 member)
- Svn (0 members)
- Swan River (1 member)
- Syncing (1 member)
- Syncronization (2 members)
- System administration (5 members)
- Systems (1 member)
- Systen administration (1 member)
- Tabular (1 member)
- Tabulate (6 members)
- Tasks (1 member)
- Taxonomy (1 member)
- Tea shelf (1 member)
- Technique (1 member)
- Technology (26 members)
- Telecottage (1 member)
- Telework (1 member)
- Templates (2 members)
- Temporal reasoning (1 member)
- Tenuous literary references (1 member)
- Terminology (1 member)
- Testing (2 members)
- Text (1 member)
- The Attic (1 member)