The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Kollogium (2 members)
- Kommunikationstheorie (7 members)
- Kybernetik (3 members)
- Lab (1 member)
- Lasse Scherffig (3 members)
- Library (2 members)
- Linklist (41 members)
- Links to course pages (7 members)
- Linux (3 members)
- Literaturliste (2 members)
- Louis Couto (1 member)
- Ludger Hennig (2 members)
- MIDI (2 members)
- MODEN (11 members)
- Machine Learning (1 member)
- Maemo (1 member)
- Mailinglist (1 member)
- Mapping (1 member)
- Mareike Maage (2 members)
- Maria Muhle (1 member)
- Mario Weise (3 members)
- Mark Shepard (1 member)
- Markus Schlaffke (2 members)
- Martin Schied (29 members)
- Martin Schneider (16 members)
- Math (1 member)
- Mathematica (1 member)
- Matthias Breuer (13 members)
- Matthias Weber (1 member)
- Maurice van Brast (9 members)
- Max/MSP (5 members)
- Max Neupert (60 members)
- Melchior Brislinger (1 member)
- Michael Markert (92 members)
- Micky Remann (9 members)
- Microcontroller (1 member)
- Miller Puckette (2 members)
- Mindaugas Gapševičius (33 members)
- Minecraft (1 member)
- Mobile (4 members)
- Mobile Development (40 members)
- Mobile Interfaces (12 members)
- Mobile Processing (3 members)
- Modellbau (6 members)
- Moritz Dreßler (3 members)
- Motor (4 members)
- Movement (2 members)
- Mtv (1 member)
- N900 (1 member)
- Nathalie Singer (4 members)