- Overdraft Studios 5
- Ovrkill 2
- OwYeaW 59
- Owen Oliver 4
- Owoc 5
- Ozma (aka Sonik Rik) 2
- Ozma777 24
- oRGy 4
- oRGy / Dalai / DarkProject 3
- oRGy / LG / Dalai 3
- oRGy/Dalai 3
- oRGy/LG/Dalai 2
- oRGy/LG/Dalai/]>CoD<[Chief 2
- oV 3
- oZ 29
- oblivion100 2
- of a map by Firebird (DOG) 2
- old_man_funk 5
- only) 2
- oo6 (-Roel`) 2
- opaopa86 4
- opiumunknown 4
- orbitx 5
- orc00 (modified from jetskimod) 3
- outpt.co.uk 10