| Ooapp | Ooapp Guestbook | 1 |
| Oocomments | Oocomments | 1 |
| Ooorl Project | Ooorl | 1 |
| Igor Khasilev | Oops Proxy Server | 2 |
| Oovoo | Oovoo | 1 |
| Apache | Oozie | 3 |
| Swapoff | Op | 1 |
| N/a | Op-browser | 1 |
| Op-browser Project | Op-browser | 1 |
| Linaro | Op-tee | 16 |
| Linaro/op-tee | Op-tee | 16 |
| Op-tee | Op-tee Os | 2 |
| Mumbojumbo | Op4 | 1 |
| OpOpenSocialPlugin | OpOpenSocialPlugin | 0 |
| OpWebAPIPlugin | OpWebAPIPlugin | 0 |
| Open-policy-agent | Opa | 2 |
| Cornelisnetworks | Opa-ff | 1 |
| Cornelisnetworks | Opa-fm | 1 |
| Opac Project | Opac | 1 |
| Nexusfi | Opac Easyweb Five | 1 |
| Ucbrise | Opaque | 1 |
| Softing | Opc | 17 |
| Softing Industrial Automation All Versions Prior To The Latest Build Of Version 4.47.0 | Opc | 17 |
| Abb | Opc Data Link | 5 |
| Cogentdatahub | Opc Datahub | 6 |
| Ioserver | Opc Drivers | 1 |
| Schneider-electric | Opc Factory Server | 5 |
| Schneider-electric | Opc Factory Server Tlxcdlfofs | 1 |
| Schneider-electric | Opc Factory Server Tlxcdltofs | 1 |
| Schneider-electric | Opc Factory Server Tlxcdluofs | 1 |
| Schneider-electric | Opc Factory Server Tlxcdstofs | 1 |
| Schneider-electric | Opc Factory Server Tlxcdsuofs | 1 |
| N/a | Opc Foundation Opc Ua .net Standard And Opc Ua .net Legacy | 1 |
| Abb | Opc Server | 6 |
| Codesys | Opc Server | 6 |
| Gesytec Easylon | Opc Server | 6 |
| Abb | Opc Server For Ac 800m | 3 |
| Abb | Opc Server For Mod 300 (non-800xa) | 5 |
| Opcsystems | Opc Systems.net | 1 |
| Softing | Opc Toolbox | 2 |
| Softing | Opc Ua C++ Sdk (software Development Kit) | 1 |
| Softing | Opc Ua C++ Software Development Kit | 15 |
| N/a | Opc Ua Products Built With The .net Framework 4.5, 4.0, And 3.5 | 1 |
| Honeywell | Opc Ua Tunneller | 4 |
| N/a | Opc Ua Tunneller | 4 |
| Siemens | Opc Unified Architecture | 1 |
| N/a | Opc-aggregator | 7 |
| Ptc | Opc-aggregator | 7 |
| Siemens | Opcenter Execution Core | 4 |
| Siemens | Opcenter Execution Discrete | 3 |
| Siemens | Opcenter Execution Foundation | 3 |
| Siemens | Opcenter Execution Process | 3 |
| Siemens | Opcenter Intelligence | 5 |
| Siemens | Opcenter Quality | 10 |
| Siemens | Opcenter Rd&l | 3 |
| Opcsystems | Opcsystems.net | 2 |
| N/a | Opcua | 1 |
| Opensea Project | Opeansea | 1 |
| Open Atrium Project | Open Atrium | 4 |
| Openautoclassifieds | Open Auto Classifieds | 1 |
| Azimyt | Open Azimyt Cms | 1 |
| Geekbill | Open Biller | 1 |
| Tomaz-muraus | Open Blog | 3 |
| SUSE | Open Build Service | 5 |
| Open Build Service | Open Build Service | 25 |
| OpenSUSE | Open Build Service | 5 |
| Opensuse | Open Build Service | 25 |
| Suse | Open Build Service | 25 |
| Opensuse | Open Buildservice | 1 |
| Devsyn | Open Bulletin Board | 4 |
| Aliacom | Open Business Management | 8 |
| Obm | Open Business Management | 8 |
| Open Business Management | Open Business Management | 8 |
| Circontrol | Open Charge Point Protocol | 5 |
| Byvoid | Open Chinese Convert | 1 |
| Open-classifieds | Open Classifieds | 1 |
| Openclassifieds | Open Classifieds 2 | 1 |
| N/a | Open Cloud Integrity Technology And Openattestation | 9 |
| Intel | Open Cloud Integrity Tehnology | 9 |
| Factorfx | Open Computer Software Inventory Next Generation | 1 |
| Open Conference Systems | Open Conference Systems | 2 |
| Public Knowledge Project | Open Conference Systems | 2 |
| Linuxfoundation | Open Container Initiative Distribution Specification | 1 |
| Linuxfoundation | Open Container Initiative Image Format Specification | 1 |
| Open Cubic Player | Open Cubic Player | 1 |
| Open Dental | Open Dental | 3 |
| Sco | Open Desktop | 1 |
| Novell | Open Desktop Server | 1 |
| Open Dhcp Server Project | Open Dhcp Server | 1 |
| Roshan Singh | Open Direct Connect Hub | 1 |
| Amazon | Open Distro | 1 |
| Gunet | Open Eclass Platform | 2 |
| Edx | Open Edx | 3 |
| Edx | Open Edx Platform | 3 |
| Openelectrical | Open Electrical Webser | 1 |
| Microsoft | Open Enclave Sdk | 4 |
| Microsoft | Open Enclave Software Development Kit | 4 |
| Micro Focus International | Open Enterprise Server | 23 |
| Microfocus | Open Enterprise Server | 23 |
| Novell | Open Enterprise Server | 23 |
