Éditeurs de vapeur avec la lettre O
| Nom | Nombre d'applications |
|---|---|
| OTAKU Plan | 90 |
| Oleg Sereda | 78 |
| Outright Games Ltd. | 69 |
| owlyboi | 50 |
| OKJOY | 39 |
| Octo Games | 30 |
| Objectif 3D | 21 |
| Owlcat Games | 21 |
| Orangepixel | 18 |
| OtakuMaker.com | 17 |
| Overaction Game Studio | 17 |
| Onyx Lute | 17 |
| Octavi Navarro | 17 |
| okyakusama | 15 |
| Offworld Industries | 15 |
| OG Games | 14 |
| OnSkull Games | 13 |
| Odencat | 13 |
| October Games | 13 |
| Oasis Games | 12 |