- Original Morbias by Myscha the sled dog. Modified into the Tower by Francois Lacombe, aka Orion(Co30) 2
- original Unreal map, edited by Strider Hiryu 2
- Original-Myscha the Sled dog/Rerun-Itchy-Muff 2
- Original: Myscha the Sled dog Redone By : §JiNx§ 2
- Original: Toady - Ported: sp1ral 5
- Original: Vanx 2
- Originally T. Ahlen/modded by Barbie 2
- Originals by Cliff Bleszinski and Myscha the Sled dog, combined by Orion(Co30) 2
- Orion(Co30) aka Mouse(Co30) 2
- Orion(Co30), aka Francois Lacombe 9
- Oscar Crego 7
- Otto 'Format Life:' Rask 3
- Otto J. Rask 2
- oukill@ 3
- OUTOFANSER 2
- outpt.co.uk 10
- oV/JennaJ-Bot 3
- Overdraft studios 4
- Owen Oliver 4
- Owoc 3
- OwYeaW 56
- oZ & Hooked on Phonics 2
- Oz and Fatal 4
- Ozma (aka Sonik Rik) 2
- Ozma777 20
- Ozma777 (aka Sonik Rik) 2