| Compuware | 2 | 3 |
| Comrak Project | 1 | 4 |
| Comscripts | 11 | 21 |
| Comsenz | 6 | 24 |
| Comstock | 1 | 1 |
| Comtechtel | 4 | 10 |
| Comtrend | 10 | 11 |
| Comus | 1 | 1 |
| Comvigo | 1 | 1 |
| Comvironment | 1 | 1 |
| Con0217 Project | 1 | 1 |
| Conarc | 1 | 1 |
| Concatus | 1 | 1 |
| Conceptcms | 1 | 1 |
| Conceptronic | 7 | 17 |
| Concerto-signage | 1 | 1 |
| Concread Project | 1 | 1 |
| Concrete Cms | 1 | 87 |
| Concrete5 | 2 | 9 |
| Concrete5-legacy Project | 1 | 5 |
| Concretecms | 1 | 87 |
| Concurrent Versions Software Project | 1 | 1 |
| Concursive | 3 | 3 |
| Conda | 1 | 1 |
| Condor | 1 | 18 |
| Condor Project | 1 | 18 |
| Conduit-rust | 1 | 1 |
| Conectiva | 1 | 2691 |
| Conexant | 1 | 1 |
| Conexware | 2 | 6 |
| Config Lib Project | 1 | 1 |
| Config-handler Project | 1 | 1 |
| Config-model Project | 1 | 2 |
| Configserver | 1 | 1 |
| Confinit Project | 1 | 1 |
| Confire Project | 1 | 1 |
| Confirm | 1 | 1 |
| Confluent | 2 | 75 |
| Conftool | 1 | 1 |
| Conga | 1 | 8 |
| Conkurent | 1 | 4 |
| Conky | 1 | 1 |
| Conlabzgmbh | 1 | 1 |
| Connect Inc. | 1 | 1 |
| Connect-pg-simple Project | 1 | 1 |
| Connect2id | 1 | 4 |
| Connection-tester Project | 1 | 1 |
| Connections Project | 1 | 59 |
| Connections-pro | 1 | 3 |
| Connectix | 1 | 3 |
| Connectwise | 7 | 27 |
| Connekthq | 3 | 11 |
| Connie-lang Project | 1 | 1 |
| Connman | 1 | 13 |
| Connx | 1 | 1 |
| Conpresso | 1 | 1 |
| Conquer-once Project | 1 | 1 |
| Conquest | 1 | 2 |
| Conquest Dicom Server Project | 1 | 1 |
| Conqueue Project | 1 | 1 |
| Conrad Hotel Project | 1 | 1 |
| Consensu.io | 1 | 1 |
| Console-io Project | 1 | 1 |
| Consolekit | 1 | 1 |
| Consolekit Project | 1 | 1 |
| Consona | 6 | 28 |
| Constantcontact | 1 | 4 |
| Constantin Charissis | 1 | 4 |
| Constantoine | 1 | 1 |
| Constructor Component | 1 | 1 |
| Constructr | 1 | 2 |
| Construtiva | 1 | 2 |
| Consulo | 1 | 1 |
| Consumer Complaints Clone Script Project | 1 | 1 |
| Consumer Reviews Script Project | 1 | 2 |
| Contact Form 7 Captcha Project | 1 | 2 |
| Contact Form Advanced Database Project | 1 | 1 |
| Contact Form Builder Project | 1 | 1 |
| Contact Form Email | 1 | 9 |
| Contact Form Submissions Project | 1 | 2 |
| Contact Form With Captcha | 1 | 2 |
| Contact Form With Captcha Project | 1 | 2 |
| Contact Forms | 1 | 2 |
| Contact List Pro | 1 | 1 |
| Contact-form-7-datepicker Project | 1 | 1 |
| Contact-form-7-to-database-extension Project | 1 | 1 |
| Contactus | 1 | 1 |
| Containerd | 2 | 12 |
| Containers | 1 | 4 |
| Containers Project | 1 | 2 |
| Containers-image Project | 1 | 1 |
| Containous | 1 | 17 |
| Contao | 2 | 32 |
| Contec | 2 | 38 |
| Contec Co., Ltd. | 1 | 20 |
| Contec-touch | 2 | 3 |
| Contelligent | 1 | 1 |
| Contempoinc | 1 | 1 |
| Contempothemes | 1 | 2 |
| Contenido | 2 | 7 |
