| Cache Project | 1 | 7 |
| Cached-path-relative Project | 1 | 2 |
| Cacheflow | 1 | 2 |
| Cacheguard | 1 | 1 |
| Cachethq | 1 | 1 |
| Cacti | 2 | 143 |
| Cactus Software | 1 | 2 |
| Cactushop | 1 | 5 |
| Cactusoft | 3 | 8 |
| Cactusthemes | 1 | 1 |
| Cactusvpn | 1 | 2 |
| Caddy Project | 1 | 9 |
| Caddyserver | 1 | 9 |
| Cadenix | 1 | 1 |
| Cadpage | 1 | 1 |
| Cadsoft | 1 | 3 |
| Cafeengine | 1 | 3 |
| Cafelog | 2 | 6 |
| Cafuego | 1 | 4 |
| Cagintranetworks | 1 | 27 |
| Cahier De Textes | 1 | 4 |
| Cainthebest | 1 | 1 |
| Cairographics | 1 | 11 |
| Cakefoundation | 1 | 11 |
| Cakephp | 1 | 11 |
| Calacode | 3 | 25 |
| Calamares | 1 | 2 |
| Calamine Project | 1 | 1 |
| Calamp | 6 | 6 |
| Calarepasoftware | 1 | 1 |
| Calcom | 2 | 2 |
| Caldera | 14 | 166 |
| Calderaforms | 1 | 3 |
| Calderalabs | 1 | 3 |
| Cale Dunlap | 1 | 2 |
| Calendar Plugin | 1 | 1 |
| Calendar Plugin Project | 1 | 1 |
| Calendar01 Project | 1 | 3 |
| Calendar02 Project | 1 | 2 |
| Calendarform01 Project | 1 | 1 |
| Calendarix | 1 | 3 |
| Calendarscript | 1 | 4 |
| Calendarscripts | 1 | 2 |
| Calendarscripts.com | 1 | 2 |
| Calendarxp | 2 | 2 |
| Calender Base Project | 1 | 1 |
| Calesanz | 1 | 1 |
| Calibre-ebook | 1 | 7 |
| Calibre-web Project | 1 | 18 |
| Calibreweb | 1 | 2 |
| Calife | 1 | 1 |
| Calimero.cms | 1 | 2 |
| Calipso Project | 1 | 1 |
| Calisto | 1 | 1 |
| Call Center Software | 1 | 1 |
| Call Project | 1 | 1 |
| Call-cc | 3 | 22 |
| Call-center-software | 1 | 3 |
| Calligra | 1 | 2 |
| Callisto | 1 | 1 |
| Callrail | 1 | 1 |
| Calmar-webmedia | 1 | 1 |
| Calmquist.static-server Project | 1 | 1 |
| Calogic | 2 | 5 |
| Caloris Planitia Technologies | 2 | 2 |
| Cam | 1 | 1 |
| Cam Development | 1 | 1 |
| Camaleo | 1 | 1 |
| Camaleon Cms | 1 | 6 |
| Camaleon Cms | 1 | 2 |
| Cambio Project | 1 | 1 |
| Cambium Networks | 10 | 46 |
| Cambiumnetworks | 25 | 89 |
| Cambridge Computer Corporation | 3 | 4 |
| Cambridge Enterprise | 1 | 1 |
| Camera Life | 1 | 5 |
| Cameron Mckay | 1 | 1 |
| Cameron Morland | 1 | 1 |
| Cameron Simpson | 1 | 1 |
| Camilova | 1 | 1 |
| Caminova | 1 | 2 |
| Camouflage | 1 | 1 |
| Campaign Monitor Project | 1 | 2 |
| Campcodes | 2 | 3 |
| Camportail | 1 | 1 |
| Camptocamp | 1 | 1 |
| Campustv | 1 | 1 |
| Campusvirtualcomputrade | 1 | 3 |
| Campware.org | 1 | 5 |
| Camshot | 1 | 1 |
| Camtron | 2 | 10 |
| Camunda | 2 | 2 |
| Canadapps | 1 | 1 |
| Canal44 | 1 | 1 |
| Canarylabs | 2 | 2 |
| Canarymail | 1 | 1 |
| Candidate-application-form Project | 1 | 1 |
| Candlepinproject | 1 | 5 |
| Candy Blast Project | 1 | 1 |
| Candy Girl Party Makeover Project | 1 | 1 |
