The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

• AJAX‏‎ (6 members)
• About Moodle‏‎ (17 members)
• Accessibility‏‎ (5 members)
• Accounts‏‎ (12 members)
• Activity modules‏‎ (19 members)
• Administrator‏‎ (58 members)
• Assignment‏‎ (19 members)
• Audio‏‎ (7 members)
• Authentication‏‎ (30 members)
• Backup‏‎ (55 members)
• Block‏‎ (121 members)
• Blocks‏‎ (2 members)
• Blog‏‎ (23 members)
• Book‏‎ (11 members)
• Calendar‏‎ (15 members)
• Capabilities‏‎ (507 members)
• Certificate‏‎ (6 members)
• Chat‏‎ (9 members)
• Chemistry‏‎ (14 members)
• Choice‏‎ (8 members)
• Coding guidelines‏‎ (13 members)
• Comments‏‎ (8 members)
• Common Cartridge‏‎ (4 members)
• Completion‏‎ (18 members)
• Conditional activities‏‎ (6 members)
• Conferences‏‎ (1 member)
• Constructivism‏‎ (0 members)
• Contributed code‏‎ (263 members)
• Contributed plugin‏‎ (4 members)
• Course‏‎ (63 members)
• Course format‏‎ (5 members)
• Creating the RSA Key File‏‎ (1 member)
• Creating the X.509 Certificate‏‎ (1 member)
• Credits‏‎ (1 member)
• DB‏‎ (20 members)
• Database‏‎ (0 members)
• Database activity module‏‎ (27 members)
• Dataform module‏‎ (20 members)
• Developer‏‎ (227 members)
• Developer tools‏‎ (12 members)
• Disambiguation‏‎ (11 members)
• Discipline-specific Moodling‏‎ (7 members)
• Editing text‏‎ (7 members)
• Enrolment‏‎ (52 members)
• Environment‏‎ (28 members)
• Error‏‎ (87 members)
• Examples of use‏‎ (2 members)
• External tool‏‎ (10 members)
• FAQ‏‎ (85 members)
• Feedback‏‎ (21 members)