The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Brian Larson Clark (9 members)
- C (9 members)
- CSS (4 members)
- CUDA (1 member)
- Cao Jing (1 member)
- Cellular Automaton (1 member)
- Chemical Geometry (1 member)
- Christian Doeller (1 member)
- Christine Hill (15 members)
- Cinema 4D (1 member)
- Cisco (2 members)
- Clemens Wegener (7 members)
- Cocoa (27 members)
- Community (3 members)
- Computation (2 members)
- Computational Craft (1 member)
- Computational Design (1 member)
- Computer Vision (2 members)
- Computer graphics (10 members)
- Conceptual Art (1 member)
- Coorperation (1 member)
- Courses (37 members)
- 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)
- Elictricity (1 member)
- Embedded (1 member)
- Embroidery (1 member)
- Equipment (1 member)
- Erek Kühn (1 member)
- Ethiopia (2 members)
- Event (3 members)
- Excursion (18 members)