| Abbreviation | Definition |
|---|---|
| OSERA | Open Source E-GOV Reference Architecture |
| OSFS | Open Source and Free Software |
| OSGi | Open Source Gateway intiative |
| OSII | Operating System Interface Infrastructure |
| OSIS | Open Source Information System |
| OSL | Object Support Library |
| OSL | OHBA Software Library |
| OSL | Open Software License |
| OSLO | Optics Software for Layout and Optimization |
| OSLO | Optics Software for Layout and Optimization31 |
| OSMC | Open Source Media Center |
| OSP | Office of Student Programming |
| OSP | Open Specification Promise |
| OSP | Owandy Software Package |
| OSPFW | Online Service Portal FrameWork |
| OSQ | Office Supplies Quick |
| OSQ | Open Source Quarterly |
| OSQ | Operating System Query |
| OSQA | Open Source Question and Answer system |
| OSR | OEM (Original Equipment Manufacturer) Service Release |