| Open Systems Interconnection Network | Open Systems Interconnection Network Layer Control Protocol | Open Systems Interconnection/Reference Model | Open Systems Interconnection Reference Model | Open Systems Interconnection Technical and Office Protocol |
| Open Systems Interconnection Transaction Processing | Open Systems Interconnection Working Group | Open Systems Interface Standards List | Open Systems International | Open Systems Interoperability |
| Open Systems Joint Task Force | Open Systems Local Area Network | Open Systems Management Industry Collaboration | Open Systems Message Exchange | Open Systems Network |
| Open Systems Network Support | Open System Solution | Open Systems Principle User Processor | Open Systems Profile | Open Systems Resources, Inc |
| Open Systems SnapVault | Open Systems Software Division | Open Systems Software Group | Open Systems Specialists | Open Systems Standards Profile |
| Open Systems Television | Open Systems Testing Consortium | Open Systems Theory | Open System Support Matrix | Open System Technologies |
| Open System Testing Consortium | Open System Transport and Session Support | Open System Utilities | Open Tape Format | Open Tape Management System |
| Open Targeting Exchange | Open Technical Dictionary | Open Technical Support | Open Technology Business Center | Open Technology Centre |
| Open Technology Development | Open Technology Group, Inc. | Open Technology Support Unit | Open Technology Users Network | Open Tech Support |
| Open Telecom Infrastructure | Open Telecommunications Framework | Open Telecom Platform | Open Test Architecture | Open Testing Service |
| Open Text Based Assessment | Open Text Corporation | OpenText Media Management | Open Text Mining Initiative | Open Text Mining Interface |
| Open Text Social Media | Open That Bottle Night | Open the Door | Open Theme Standard | Open Theological College |
| OPEN: the Small Business Network | Open the Web | Open Thy Mouth | Open Tilburgse Kampioenschappen Indoorroeien | Open Tip Flat Base |
| Open Tip Match | Open to Air | Open to All | Open to Below | Open-To-Buy |
| Open to Ceiling Space | Open Token Foundation | Open to New Opportunity | Open Tool Interface | Open Tool Kit |
| Open Top | Open Topped Container | Open Topped Filing Cabinet | Open Top Vapor Cleaner | Open to Sky |
| Open Total Mesorectal Excision | Open Touristic Data Standard | Open Trace Format | Open Track Challenge | Open Track Manager |
| Open Trade Equity | Open Trade Training Centre | Open Trading Protocol | Open Training and Education Network | Open Training Platform |
| Open Transaction Environment | Open Transaction Manager Access | Open Translation Engine | Open Transport | Open Transport Network |
| Open Transport/Point-To-Point Protocol | Open Transport Service | Open Transport Tycoon Deluxe | OpenTravel Alliance | Open Travel Data Access Protocol |
| Open Tubular Capillary Electro-Chromatography | Open Tubular Liquid Chromatography | Open Two Seater | Open Type | Open Type Font |
| Open Type Fonts | Open Type Layout | OpenType Layout | Open Type Layout Services | Open Type Organizer |
| Open Type Xml | OpenU | OpenUMI | Open Unified Process | Open Uniform Resource Locator |
| Open Universiteit | Open Universiteit Nederland | Open Universities Australia | Open University | Open University and Continuing Education |
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