| Open Translation Engine | 1 | 1 |
| Open Source Internet Solutions | 1 | 1 |
| Open | 1 | 1 |
| Opclabs | 1 | 1 |
| Open-feature | 1 | 1 |
| Open Dhcp Server Project | 1 | 1 |
| Opayweb | 1 | 1 |
| Open Assessment Technologies | 1 | 1 |
| Op'art Save Cart Project | 1 | 1 |
| Open Dc Hub | 1 | 1 |
| Op-browser Project | 1 | 1 |
| Oovoo | 1 | 1 |
| Ontariosystems | 4 | 1 |
| Onlinevotingsystem Project | 1 | 1 |
| Online Shop Store Project | 1 | 1 |
| Onlinestorekit | 1 | 1 |
| Ooorl Project | 1 | 1 |
| Oomphinc | 1 | 1 |
| Online Shopping System Advanced Project | 1 | 1 |
| Onwebchat | 1 | 1 |
