| Abbreviation | Definition |
|---|---|
| OSRD | Open Source Research and Development |
| OSRI | Operating System Re-Installation |
| OSS | Open Source Software |
| OSS | Open Sourced Software |
| OSS | Open System Software |
| OSS | Openly Stealable Source |
| OSS | Opera Schedule Server |
| OSS | Operating System Switch |
| OSS | Operating Systems Software |
| OSSC | Open Source Software Company |
| OSSCAR | Open Software Services for Classrooms And Research |
| OSSCC | Open Source Software Collaboration Counseling |
| OSSD | Open Source Software Development |
| OSSI | Open Source Software Institute |
| OSSO | Open Source Software Operations |
| OSSP | Open Source Software Project |
| OSSP | Organization Standard Software Process |
| OSSV | Open Systems SnapVault |
| OSU | Open Source Unix |
| OSU | Other Software Unit |