The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ipad (20 members)
- Iphone (23 members)
- Iteration Mobile S.L (3 members)
- J2ME (5 members)
- J2me (5 members)
- John Poliquin (1 member)
- KAB Software (1 member)
- Kickflip.net (1 member)
- Kiki brukhis (1 member)
- Koei (2 members)
- Konami (10 members)
- Kongregate Inc. (2 members)
- LCD (2 members)
- LCD Game (1 member)
- LEGO Media International, Inc. (2 members)
- LJN (2 members)
- Lcd (1 member)
- Lce (1 member)
- LeapFrog Enterprises, Inc. (1 member)
- LeapTV (1 member)
- Leaptv (1 member)
- Linux (2 members)
- Lynx (1 member)
- M&M Software (1 member)
- MFORMA Group Inc. (1 member)
- MUZBOZ Games (1 member)
- Mac (12 members)
- Mac Joy (1 member)
- Maple Media LLC (3 members)
- Mastertronic (4 members)
- Melbourne House Games Ltd. (2 members)
- Michael Oltmans (1 member)
- Micro Cabin (3 members)
- Microsoft MS-DOS (4 members)
- Microsoft Windows (58 members)
- Microsoft XBOX (10 members)
- Microsoft XBOX 360 (11 members)
- Microsoft Xbox One (8 members)
- Midway (2 members)
- Miniclip Limited (3 members)
- Mobile (2 members)
- Musicbank (1 member)
- N64 (3 members)
- Natsume (2 members)
- Nds (7 members)
- Nes (10 members)
- Ngage (1 member)
- Ngc (14 members)
- Nickelodeon (1 member)
- Nintendo (3 members)