| Company Name | Software Titles |
|---|---|
| Qwizdom | 3 |
| Qwest | 5 |
| QwertyLab | 1 |
| QuteCom | 1 |
| Qurb | 1 |
| QuorumLabs | 1 |
| Quorum Software | 1 |
| Quizulous | 1 |
| Quintum Technologies | 1 |
| Quinnware | 2 |
| Quiksoft | 3 |
| QuickTime Installer for OS X | 1 |
| QuickPen | 2 |
| QuickPDF | 1 |
| Quickarrow | 6 |
| Quick-PDF.com | 1 |
| Quick Hit | 1 |
| QueTek Consulting | 1 |
| Questra | 1 |
| Questionmark | 12 |
| Question Writer | 1 |
| Quest Software Inc. | 5 |
| Quest Software | 2 |
| Quest | 136 |
| Queen's University at Kingston | 1 |
| Quask Switzerland | 1 |
| Quartz Debug | 1 |
| Quartics | 1 |
| QuarkXPress | 6 |
| Quark | 15 |
| Quantum Intech | 2 |
| Quantum | 3 |
| Quantrix | 1 |
| Quantim | 1 |
| QualityCodec Software | 1 |
| Qualitran Professional Services | 1 |
| Qualint | 1 |
| Qualcomm | 19 |
| Quadrox | 1 |
| Quadrant Software | 5 |
| Quadramed | 1 |
| Quadralay | 2 |
| QT Project | 1 |
| QT P | 1 |
| QSX Software Group | 2 |
| QSR International Pty | 1 |
| QSR Automations | 1 |
| QSP | 1 |
| QSI Systems | 2 |
| QS-Data Systems | 2 |