| Open Source Technology Group | 1 | 1 |
| Open Tibia Server Cms | 1 | 2 |
| Open Translation Engine | 1 | 1 |
| Open Webmail | 1 | 6 |
| Open-audit | 1 | 22 |
| Open-blog | 1 | 1 |
| Open-classifieds | 1 | 1 |
| Open-device Project | 1 | 1 |
| Open-emr | 1 | 134 |
| Open-feature | 1 | 1 |
| Open-formulieren | 1 | 2 |
| Open-ftpd | 1 | 1 |
| Open-gorotto | 1 | 1 |
| Open-iscsi Project | 1 | 3 |
| Open-medium | 1 | 1 |
| Open-policy-agent | 1 | 2 |
| Open-realty | 1 | 5 |
| Open-school | 1 | 5 |
| Open-systems | 1 | 1 |
| Open-telemetry | 3 | 5 |
| Open-uri-cached Project | 1 | 1 |
| Open-xchange | 12 | 220 |
| Open-xchange Gmbh | 1 | 1 |
| Open-xchange Ox Guard | 1 | 1 |
| Open-zaak | 1 | 0 |
| Open.gl Project | 1 | 1 |
| OpenEuler | 7 | 11 |
| OpenMF | 1 | 1 |
| OpenSUSE | 25 | 337 |
| Openads | 1 | 5 |
| Openafs | 1 | 34 |
| Openam Consortium | 2 | 14 |
| Openapi-generator | 1 | 5 |
| Openarena | 1 | 3 |
| Openasp | 1 | 1 |
| Openautoclassifieds | 1 | 1 |
| Openbase International Ltd | 1 | 9 |
| Openbb | 1 | 5 |
| Openbiblio | 1 | 6 |
| Openbook | 1 | 1 |
| Openbor | 1 | 1 |
| Openbravo | 1 | 3 |
| Openbsd | 6 | 3024 |
| Openca | 2 | 4 |
| Opencart | 1 | 24 |
| Opencast | 1 | 16 |
| Openchrome | 1 | 1 |
| Openci | 1 | 1 |
| Openclassifieds | 1 | 1 |
| Openconcept | 1 | 4 |
| Openconext | 1 | 1 |
| Openconnect | 1 | 2 |
| Openconstructor Project | 1 | 4 |
| Opencontainers | 2 | 5 |
| Opencosmo | 1 | 1 |
| Opencryptoki Project | 1 | 4 |
| Opencv | 1 | 34 |
| Opencv.js Project | 1 | 1 |
| Opendap | 3 | 5 |
| Opendarwin | 1 | 3 |
| Opendaylight | 6 | 36 |
| Opendb | 1 | 2 |
| Opendental | 1 | 4 |
| Opendesa | 1 | 3 |
| Opendesign | 1 | 27 |
| Opendnssec | 1 | 1 |
| Opendoc | 1 | 1 |
| Opendock | 3 | 4 |
| Opendocman | 1 | 13 |
| Opendolphin | 1 | 3 |
| Openeclass | 1 | 2 |
| Openedit | 1 | 3 |
| Openedit Inc | 1 | 1 |
| Openedx | 2 | 2 |
| Openelec | 1 | 3 |
| Openelectrical | 1 | 1 |
| Openemr | 2 | 127 |
| Openenclave | 1 | 1 |
| Openenergymonitor | 1 | 4 |
| Openengine | 1 | 4 |
| Openevidence | 1 | 2 |
| Openexif Project | 1 | 5 |
| Openexr | 1 | 51 |
| Openfabrics | 5 | 8 |
| Openfaq | 1 | 1 |
| Openfga | 1 | 9 |
| Openfiler | 1 | 4 |
| Openframe-ascii-image Project | 1 | 1 |
| Openframe-glslviewer Project | 1 | 1 |
| Openframe-image Project | 1 | 1 |
| Openfreeway | 1 | 6 |
| Openftpd | 1 | 1 |
| Opengear | 7 | 7 |
| Opengoo | 1 | 2 |
| Opengroup | 1 | 92 |
| Openh323 Project | 2 | 2 |
| Openhab | 1 | 1 |
| Openhacker Project | 1 | 2 |
| Openhandsetalliance | 1 | 7 |
| Openhpi | 1 | 1 |
