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

• AJAX‏‎ (7 members)
• About Moodle‏‎ (18 members)
• Accessibility‏‎ (5 members)
• Accounts‏‎ (6 members)
• Activity modules‏‎ (15 members)
• Administrator‏‎ (128 members)
• Assignment‏‎ (11 members)
• Audio‏‎ (7 members)
• Australian Universities‏‎ (1 member)
• Authentication‏‎ (31 members)
• Backup‏‎ (49 members)
• Block‏‎ (57 members)
• Blocks‏‎ (0 members)
• Blog‏‎ (19 members)
• Calendar‏‎ (10 members)
• Capabilities‏‎ (295 members)
• Certificate‏‎ (6 members)
• Chat‏‎ (6 members)
• Choice‏‎ (8 members)
• Coding guidelines‏‎ (13 members)
• Comments‏‎ (3 members)
• Common Cartridge‏‎ (3 members)
• Completion‏‎ (15 members)
• Conditional activities‏‎ (5 members)
• Conferences‏‎ (3 members)
• Constructivism‏‎ (0 members)
• Contributed code‏‎ (227 members)
• Cookies‏‎ (1 member)
• Course‏‎ (51 members)
• Course format‏‎ (3 members)
• Creating the RSA Key File‏‎ (1 member)
• Creating the X.509 Certificate‏‎ (1 member)
• Credits‏‎ (1 member)
• DB‏‎ (19 members)
• Database‏‎ (0 members)
• Database activity module‏‎ (22 members)
• Dataform module‏‎ (2 members)
• Developer‏‎ (239 members)
• Developer tools‏‎ (13 members)
• Disambiguation‏‎ (23 members)
• Discipline-specific Moodling‏‎ (4 members)
• Editing text‏‎ (5 members)
• Enrolment‏‎ (37 members)
• Environment‏‎ (26 members)
• Error‏‎ (65 members)
• Examples of use‏‎ (4 members)
• Experimental Features‏‎ (1 member)
• FAQ‏‎ (78 members)
• Feedback‏‎ (8 members)
• File‏‎ (3 members)