| Openser | 2 | 5 |
| Openshift | 4 | 198 |
| Openshift Cartridge | 1 | 1 |
| Openshift Enterprise | 3 | 3 |
| Openshift Haproxy Cartridge | 1 | 1 |
| Openshift Mongodb Cartridge | 1 | 1 |
| Openshift Origin | 1 | 12 |
| Openshift-origin-controller Project | 1 | 1 |
| Opensips | 1 | 12 |
| Opensiteadmin | 1 | 2 |
| Openskip | 1 | 2 |
| Openslides | 1 | 1 |
| Openslp | 1 | 9 |
| Openslp-dfsg | 1 | 1 |
| Opensmtpd | 1 | 8 |
| Opensns | 1 | 3 |
| Opensolution | 6 | 28 |
| Opensource | 1 | 12 |
| Opensource Classified Ads Script Project | 1 | 4 |
| Opensource Technologies | 1 | 1 |
| Opensource-socialnetwork | 1 | 7 |
| Opensourcebms | 1 | 1 |
| Opensourceclassifieds | 1 | 1 |
| Opensrcsec | 2 | 4 |
| Openssl | 3 | 266 |
| Openssl Software Foundation | 1 | 264 |
| Openssl.js Project | 1 | 1 |
| Openstack | 59 | 610 |
| Openstack Foundation | 1 | 2 |
| Openstack-dashboard | 1 | 1 |
| Openstack-nova | 1 | 2 |
| Openstack-utils | 1 | 1 |
| Opensurveypilot | 1 | 1 |
| Opensuse | 51 | 4489 |
| Opensuse Project | 9 | 4124 |
| Openswan | 2 | 22 |
| Opensymphony | 2 | 8 |
| Opensynergy | 1 | 1 |
| Opentext | 21 | 153 |
| Openthread | 1 | 2 |
| Opentools | 1 | 4 |
| Opentrade Project | 1 | 2 |
| Opentsdb | 1 | 7 |
| Openttd | 1 | 20 |
| Opentype Sanitiser Project | 1 | 1 |
| Openvas | 4 | 31 |
| Openvas-scanner | 1 | 1 |
| Openvcloud Project | 1 | 1 |
| Openvmps | 1 | 1 |
| Openvpn | 4 | 120 |
| Openvpn Technologies, Inc | 1 | 33 |
| Openvpn-monitor Project | 1 | 3 |
| Openvswitch | 1 | 23 |
| Openvz | 2 | 4 |
| Openwall | 2 | 4 |
| Openwaygroup | 1 | 2 |
| Openwbem | 1 | 1 |
| Openweave | 1 | 3 |
| Openwebanalytics | 1 | 7 |
| Openwebif Project | 1 | 4 |
| Openwebmail.acatysmoof | 1 | 1 |
| Openwfe | 1 | 2 |
| Openwhyd | 1 | 2 |
| Openwiki | 1 | 1 |
| Openwrt | 4 | 56 |
| Openwsman | 1 | 4 |
| Openwsman Project | 1 | 4 |
| Openx | 2 | 14 |
| Openzaak | 1 | 1 |
| Openzeppelin | 3 | 37 |
| Openzfs | 1 | 4 |
| Opera | 7 | 337 |
| Opera Software | 2 | 35 |
| Opera Software As | 1 | 2 |
| Opf | 1 | 8 |
| Opial | 2 | 7 |
| Opmantek | 2 | 24 |
| Opmc | 1 | 1 |
| Opnsense | 1 | 20 |
| Opnsense Project | 1 | 20 |
| Opopensocialplugin | 1 | 1 |
| Oppia | 1 | 1 |
| Oppo | 63 | 102 |
| Ops-robots-txt Project | 1 | 1 |
| Opscode | 1 | 4 |
| Opservices | 1 | 5 |
| Opsramp | 1 | 72 |
| Opsview | 2 | 18 |
| Opsware | 1 | 1 |
| Opswat | 1 | 4 |
| Opt-net | 1 | 2 |
| Optergy | 2 | 42 |
| Optical Character Recognition Project | 1 | 4 |
| Opticam | 3 | 60 |
| Optim | 1 | 1 |
| Optim Corporation | 1 | 1 |
| Optimalog | 1 | 2 |
| Optimizepress | 1 | 1 |
| Optimocha | 1 | 2 |
| Optinmonster | 1 | 5 |
