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

• AIX‏‎ (1 member)
• ARM‏‎ (33 members)
• ARM/de‏‎ (3 members)
• ARM/es‏‎ (3 members)
• ARM/fi‏‎ (1 member)
• ARM/hu‏‎ (1 member)
• ARM/id‏‎ (2 members)
• ARM/ru‏‎ (1 member)
• ARM/zh CN‏‎ (2 members)
• ATSynEdit‏‎ (2 members)
• AVR‏‎ (37 members)
• AVR/de‏‎ (23 members)
• AVR/es‏‎ (1 member)
• Abandoned‏‎ (1 member)
• Abandoned/fr‏‎ (1 member)
• Accessibility‏‎ (4 members)
• Afrikaans‏‎ (2 members)
• AllCtg/ru‏‎ (150 members)
• AmigaOS‏‎ (9 members)
• Android‏‎ (19 members)
• Android/es‏‎ (4 members)
• Android/fr‏‎ (2 members)
• Android/ja‏‎ (2 members)
• Android/ko‏‎ (2 members)
• Android/pl‏‎ (1 member)
• Android/pt‏‎ (1 member)
• Android/ru‏‎ (8 members)
• Android/zh CN‏‎ (1 member)
• Applications created with Lazarus‏‎ (15 members)
• Applications created with Lazarus/de‏‎ (3 members)
• Applications created with Lazarus/es‏‎ (3 members)
• Applications created with Lazarus/fi‏‎ (1 member)
• Applications created with Lazarus/fr‏‎ (4 members)
• Applications created with Lazarus/ja‏‎ (1 member)
• Applications created with Lazarus/pl‏‎ (1 member)
• Applications created with Lazarus/ru‏‎ (1 member)
• Applications created with Lazarus/sk‏‎ (1 member)
• Applications written in Free Pascal‏‎ (5 members)
• Arabic‏‎ (12 members)
• Arduino‏‎ (37 members)
• Arduino/de‏‎ (23 members)
• Arduino/es‏‎ (1 member)
• Artwork‏‎ (24 members)
• Artwork/de‏‎ (2 members)
• Artwork/fr‏‎ (4 members)
• Artwork/ja‏‎ (2 members)
• Artwork/ru‏‎ (2 members)
• Assembler‏‎ (2 members)
• Assembler/es‏‎ (1 member)
• Assembler/fr‏‎ (1 member)