The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 12na (1) (4 members)
- 2017 uncategorized coursework (7 members)
- 242-2018 People (3 members)
- 242-2019 People (14 members)
- 242 TRIZ 3D printers (37 members)
- 242 Users 2021 (5 members)
- 3-D printer users (2 members)
- 365reasons (11 members)
- 3D Printing (2 members)
- 3D modelling (6 members)
- 3D printer (1 member)
- 3D printing (555 members)
- 3d bioprinting (1 member)
- 3d printing (11 members)
- 4777 TRIZ 3D printers (40 members)
- 5490-16 (28 members)
- 5490-19 (32 members)
- 5490-2017 (20 members)
- 5490-2020 (15 members)
- 5490-2021 (14 members)
- 5621 Users 2020 (25 members)
- 5970-2017 (0 members)
- 777-2014 People (2 members)
- 777-2015 People (1 member)
- 777 Users 2019 (97 members)
- AAG Support materials (1 member)
- AI (11 members)
- ALLFED (1 member)
- ALL SAFE (43 members)
- ANTH329 Media and International Social Change (44 members)
- APSC100-Project153 (16 members)
- ASAP (24 members)
- AT Sourcebook (28 members)
- AT Sourcebook subpages (37 members)
- A People’s Food Policy (17 members)
- A People’s Food Policy files (26 members)
- A People’s Food Policy images (0 members)
- Aalto University (45 members)
- About Appropedia (0 members)
- Academia (5 members)
- Accessibility (8 members)
- Action (1 member)
- Activism (19 members)
- Activist pages (3 members)
- Acute Appendicitis (5 members)
- Additive manufacturing (5 members)
- Adelaide (3 members)
- Adelaide files (1 member)
- Adelaide images (0 members)
- Africa (75 members)