| Map | Title | Author | Players | |
|---|---|---|---|---|
| ONS-Odd-Faunus | ONS-Odd-Faunus | 16-32 | ||
| ONS-OmahaBeach-)o(-V3 | Omaha Beach | 18-32 | ||
| ONS-OriginalSin | ONS-OriginalSin | Unknown | ||
| ONS-OSR-KingOfTheHill | King Of The Hill | Unknown | ||
| ONS-OSR-Tanks-a-lot | ONS-OSR-Tanks-a-lot | 8-14 | ||
| ONS-Outback | Outback 4 | Unknown | ||
| ONS-OverRun2004 | OverRun2004 | 32 |