The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Craftraum (4 members)
- CreativeComputation (2 members)
- Cristina Valero García (2 members)
- Cryptography (1 member)
- Cultural-Heritage (2 members)
- DIY Electronics (1 member)
- Daniel Belton (1 member)
- Darsha Hewitt (9 members)
- Dataflow (2 members)
- David Hahlbrock (1 member)
- Design (63 members)
- Dessau (1 member)
- Dokumentation (20 members)
- Dominique Hurth (4 members)
- Download (1 member)
- Dérive (4 members)
- Earth (1 member)
- Ecology (1 member)
- Electronics (37 members)
- Element (55 members)