| Online Tours And Travels Management System Project | 1 | 8 |
| Online Traffic Offense Management System Project | 1 | 2 |
| Online Travel Agency System Project | 1 | 9 |
| Online Tutor Portal Site Project | 1 | 2 |
| Online Tv Database Project | 1 | 1 |
| Online Web Building | 1 | 1 |
| Online-Shopping-System-Advanced Project | 1 | 4 |
| Online-Solutions | 1 | 1 |
| Onlinegrades | 1 | 5 |
| Onlineonly | 1 | 1 |
| Onlinestorekit | 1 | 1 |
| Onlinetechtools.Com | 4 | 5 |
| Onlinetools | 1 | 1 |
| Onlinetools.Org | 1 | 2 |
| Onlinevotingsystem Project | 1 | 1 |
| Onlyoffice | 6 | 29 |
| Onlyscript.Info | 1 | 2 |
| Onnogroen | 1 | 2 |
| Onnuri Infotek | 1 | 4 |
| Onosproject | 1 | 13 |
| Ons | 1 | 1 |
| Onssi | 1 | 1 |
| Onstove | 1 | 1 |
| Ontall | 1 | 1 |
| Ontarioabandonedplaces | 1 | 1 |
| Ontariosystems | 4 | 4 |
| Onthegosystems | 1 | 4 |
| Ontrack Project | 1 | 1 |
| Ontraport | 2 | 3 |
| Onwebchat | 1 | 1 |
| Onworks | 1 | 1 |
| Onyaktech Comments Pro Project | 1 | 2 |
| Onyxforum Project | 1 | 1 |
| Ooapp | 1 | 1 |
| Oocomments | 1 | 1 |
| Oodie | 1 | 1 |
| Oomphinc | 1 | 1 |
| Ooohboi Steroids For Elementor Project | 1 | 2 |
| Ooorl Project | 1 | 1 |
| Oopspam | 1 | 2 |
| Ooso | 1 | 1 |
| Oovoo | 1 | 1 |
| Op'Art Save Cart Project | 1 | 1 |
| Op-Browser Project | 1 | 1 |
| Op-Tee | 1 | 3 |
| Op5 | 3 | 11 |
| Opac Project | 1 | 1 |
| Opalvoip | 1 | 1 |
| Opart | 1 | 1 |
| Opartfaq Project | 1 | 1 |
| Opayweb | 1 | 1 |
| Opc Ua Stack Project | 1 | 1 |
| Opcfoundation | 13 | 32 |
| Opclabs | 1 | 1 |
| Opcsystems | 2 | 3 |
| Opcua Project | 1 | 3 |
| Open | 1 | 1 |
| Open Assessment Technologies | 1 | 1 |
| Open Atrium Project | 1 | 4 |
| Open Business Management | 1 | 1 |
| Open Cas Project | 1 | 1 |
| Open Conference Systems | 1 | 1 |
| Open Cubic Player | 1 | 1 |
| Open Dc Hub | 1 | 1 |
| Open Dhcp Server Project | 1 | 1 |
| Open Explorer Beta Project | 1 | 1 |
| Open Faculty Evaluation System Project | 1 | 2 |
| Open Graph Importer Project | 1 | 1 |
| Open Graph Protocol Project | 1 | 1 |
| Open Group | 3 | 5 |
| Open Lab | 1 | 1 |
| Open Movie Editor | 1 | 1 |
| Open Newsletter | 1 | 3 |
| Open Projects Network | 1 | 1 |
| Open Searchable Image Catalogue | 1 | 4 |
| Open Solution | 2 | 10 |
| Open Source Development Network | 1 | 6 |
| Open Source Development Team | 1 | 1 |
| Open Source Internet Solutions | 1 | 1 |
| Open Source Point Of Sale Project | 1 | 1 |
| Open Source Real-Estate Script Project | 1 | 1 |
| Open Source Sacco Management System Project | 1 | 8 |
| Open Source Security Information Management | 1 | 2 |
| Open Source Technology Group | 1 | 1 |
| Open Tftp Server Project | 1 | 6 |
| Open Tibia Server Cms | 1 | 2 |
| Open Translation Engine | 1 | 1 |
| Open Upload Project | 1 | 1 |
| Open Webmail | 1 | 13 |
| Open-Audit | 1 | 6 |
| Open-Blog | 1 | 1 |
| Open-Classifieds | 1 | 1 |
| Open-Device Project | 1 | 1 |
| Open-Emr | 1 | 128 |
| Open-Falcon | 2 | 2 |
| Open-Ftpd | 1 | 1 |
| Open-Gorotto | 1 | 1 |
| Open-Graph Project | 1 | 1 |
| Open-Iscsi Project | 1 | 3 |
| Open-Medium | 1 | 1 |
