| Groups (developers) | Abbr. | Country | City | Rating | |
|---|---|---|---|---|---|
| Odbyt Design | Poland | 0.00 ±0.0 | |||
| Oddware | 0.00 ±0.0 | ||||
| Odesta | 0.00 ±0.0 | ||||
| Odsiecz Sobieskiego | 0.00 ±0.0 | ||||
| OHAUG | 0.00 ±0.0 | ||||
| Ohio State University | 0.00 ±0.0 | ||||
| Oklahoma State University | 0.00 ±0.0 | ||||
| Oliva Computer Services | 0.00 ±0.0 | ||||
| Omega Software | 0.00 ±0.0 | ||||
| Omni Tronics, Inc. | 0.00 ±0.0 | ||||
| On-Time Software, Inc. | 0.00 ±0.0 | ||||
| Ontario Educational Communications Authority | 0.00 ±0.0 | ||||
 Opacus Chiroptera | Opacus Chiroptera | Poland | 0.00 ±0.0 | ||
| Opal Software | 0.00 ±0.0 | ||||
| Optimized Systems Software, Inc. | 0.00 ±0.0 | ||||
| Optimum Resource, Inc. | 0.00 ±0.0 | ||||
| Ordinateur Express | 0.00 ±0.0 | ||||
| Orion | Poland | 0.00 ±0.0 | |||
| Orion Development | 0.00 ±0.0 | ||||
| Orion Educational Software, Inc. | 0.00 ±0.0 |
