| Cafeengine | 1 | 3 |
| Cafelog | 2 | 6 |
| Cafuego | 1 | 4 |
| Cagintranetworks | 1 | 26 |
| Cahier De Textes | 1 | 4 |
| Cainor | 1 | 1 |
| Cairographics | 1 | 11 |
| Cakefoundation | 1 | 10 |
| Cakephp | 1 | 10 |
| CalAmp | 1 | 1 |
| Calacode | 3 | 24 |
| Calamares | 1 | 2 |
| Calamine Project | 1 | 1 |
| Calarepasoftware | 1 | 1 |
| Caldera | 16 | 284 |
| Calderalabs | 1 | 1 |
| Cale Dunlap | 1 | 2 |
| Calendar Event Management System Project | 1 | 2 |
| Calendar Plugin | 1 | 1 |
| Calendarix | 1 | 3 |
| Calendarscript | 1 | 3 |
| Calendarscripts | 1 | 2 |
| Calendarscripts.com | 1 | 2 |
| Calendarxp | 2 | 2 |
| Calender Base Project | 1 | 1 |
| Calibre-ebook | 1 | 7 |
| Calibre-web Project | 1 | 2 |
| Calico | 1 | 1 |
| Calife | 1 | 1 |
| Calimero.cms | 1 | 2 |
| Calipso Project | 1 | 1 |
| Calisto | 1 | 1 |
| Call-cc | 3 | 16 |
| Call-center-software | 1 | 3 |
| CallRail, Inc. | 1 | 1 |
| Call Center Software | 1 | 1 |
| Callback Technologies | 1 | 3 |
| Calligra | 1 | 2 |
| Callisto | 1 | 1 |
| Calmar-webmedia | 1 | 1 |
| Calogic | 2 | 5 |
| Caloris Planitia Technologies | 2 | 2 |
| Calsign | 1 | 1 |
| Cam | 1 | 1 |
| Cam Development | 1 | 1 |
| Camaleo | 1 | 1 |
| Cambio Project | 1 | 1 |
| Cambium | 1 | 1 |
| Cambium Networks | 3 | 17 |
| Cambium Networks | 4 | 8 |
| Cambiumnetworks | 6 | 6 |
| Cambridge Computer Corporation | 3 | 4 |
| Cambridge Enterprise | 1 | 1 |
| Camera Life | 1 | 7 |
| Cameron Mckay | 1 | 1 |
| Cameron Morland | 1 | 1 |
| Cameron Simpson | 1 | 1 |
| Caminova | 1 | 2 |
| Camouflage | 1 | 1 |
| Camp Project | 1 | 1 |
| Camp Style Project Line Project | 1 | 1 |
| Campaign Monitor | 1 | 1 |
| Campaign Monitor Project | 1 | 1 |
| Campbell Scientific | 5 | 5 |
| Campcodes | 13 | 87 |
| Camportail | 1 | 1 |
| Campustv | 1 | 1 |
| Campusvirtualcomputrade | 1 | 3 |
| Campware.org | 1 | 9 |
| Camsbiometrics | 1 | 1 |
| Camshot | 1 | 1 |
| Camtron | 2 | 10 |
| Camunda | 2 | 2 |
| Canaan | 1 | 1 |
| Canadapps | 1 | 1 |
| Canal44 | 1 | 1 |
| Canarylabs | 2 | 2 |
| Canarymail | 1 | 1 |
| Candidate-application-form Project | 1 | 1 |
| Candlepinproject | 1 | 3 |
| Candy Blast Project | 1 | 1 |
| Candy Girl Party Makeover Project | 1 | 1 |
| Candycaneapps | 1 | 1 |
| Candypress | 1 | 9 |
| Canebluem | 1 | 1 |
| Canna | 1 | 2 |
| Cannot | 1 | 3 |
| Canon | 77 | 133 |
| Canon IT Solutions Inc. | 1 | 1 |
| Canon Inc. | 2 | 11 |
| Canon, Inc. | 1 | 6 |
| Canon-its | 1 | 1 |
| Canonical | 61 | 3432 |
| Canonical Ltd. | 8 | 39 |
| Cantata Project | 1 | 6 |
| Canteen Management System Project | 1 | 19 |
| Cantemo | 1 | 41 |
| Cantico | 1 | 10 |
| Canto | 2 | 7 |
| Canyon-tech | 4 | 8 |
