| Groups (developers) | Abbr. | Country | City | Rating | |
|---|---|---|---|---|---|
| Orion | Poland | 0.00 ±0.0 | |||
| Orion Development | 0.00 ±0.0 | ||||
| Orion Educational Software, Inc. | 0.00 ±0.0 | ||||
| Our 5oft | Poland | 0.00 ±0.0 | |||
| Outland Quest Software | 0.00 ±0.0 | ||||
| Overlords | Germany | 0.00 ±0.0 | |||
| Oxyron | Germany, Poland | , Cracow (Kraków) | 0.00 ±0.0 | ||
| Ozark Softscape | 0.00 ±0.0 |
