| OSL | Open Source Lab |
| OS | Open Source |
| WOS | Wizards of Open Source |
| OSI | Open Source Initiative |
| OSD | Open Source Definition |
| OSRM | Open Source Risk Management |
| OSS | Open Source Software/Solution |
| OSSO | Open Source Solutions Operation [HP] |
| OMF | Open Source Metadata Framework |
| AOSL | APSR Open Source License [engl.] |
| OSDL | Open Source Development Lab/Labs, Oregon |
| GOSPL | Generalized Open Source Programmable Logic |
| SRC | Source |
| SI | Source Index |
| tex | Dokument [TeX-Source] eine Dateiendung |
| SR | Source Routing |
| SSRC | Synchronization Source Identifier |
| java | Source der Java Programmiersprache von Sun eine Dateiendung |
| LMIS | Liquid Metal Ion Source |
| SLT | Standardized Light Source |
| SRB | Source Route Bridging [IBM] |
| SSE | Structured Source Editing |
| MRS | Master Reference Source |
| SLOC | Source Lines Of Code |
| rpt | Source / Report [DataFlex] eine Dateiendung |
| SDA | Source Data Automation |
| SSM | Source Specific Multicast |
| DSR | Dynamic Source Routing |
| RTSL | Read The Source Luke |
| SCSL | Sun Community Source Licensing |
| PFS | Programmable Frequency Source |
| QRSS | Quasi Random Signal Source |
| SCCS | Source Code Control System |
| RSRB | Remote Source Route Bridging |
| RSCS | Remote Source Control System |
| SQUID | Source Quench Introduced Delay |
| SRT | Source Route / Routing Transparent |
| ASF | Aspect Source Flag [engl.] |
| MLL | Molecular Luminescence spectrometry with Line source |
| APSL | Apple Public Source License [engl.] |
| HESSLA | Hacktivismo Enhanced Source Software License Agreement |
| ASL | ACPI Control Method Source Language [engl.] |
| OT | Open Transport |
| STGO | Start Tag Open |
| XOM | X / Open Management |
| o.c. | open cup [engl.] Flammpunktbestimmung mit offenem Tiegel |
| OC | Open Control |
| ONM | Open Network Management |
| ONN | Open Network Node |
| ONP | Open Network Provision |