| Company Name | Software Titles |
|---|---|
| Open Source | 712 |
| Oracle | 100 |
| OSISoft | 60 |
| OLYMPUS | 21 |
| Online Media Technologies Ltd. | 18 |
| O2Micro | 17 |
| Omron | 15 |
| Optical Image Technology | 15 |
| OpenText | 14 |
| Oticon A-S | 8 |
| Open Design Alliance | 8 |
| OEM | 7 |
| OKI Printing Solutions | 7 |
| Oberon Media | 7 |
| Okidata | 6 |
| OSI Software | 6 |
| Omtool | 6 |
| Option NV | 6 |
| Ontrack Data Recovery | 5 |
| Open Text Corporation | 5 |
| onOne Software | 5 |
| OPENXTRA Limited | 5 |
| OnSSI | 5 |
| Open Solutions | 4 |
| Omniture | 4 |