| Carbonblack | 2 | 5 |
| Carboncommunities | 1 | 2 |
| Carbonexchangecointoken Project | 1 | 1 |
| Carbonite | 1 | 1 |
| Carbonize | 1 | 2 |
| Carceresbe Project | 1 | 1 |
| Card Holder Management System Project | 1 | 1 |
| Cardfactory Project | 1 | 1 |
| Cardgate | 1 | 2 |
| Cardinal Cms Project | 1 | 1 |
| Cardosystems | 1 | 1 |
| Cardozatechnologies | 2 | 3 |
| Cardway | 1 | 1 |
| Care 2002 | 1 | 2 |
| Care Clone Project | 1 | 1 |
| Care2X | 4 | 5 |
| Carefusion | 1 | 4 |
| Carel | 10 | 15 |
| Carello | 1 | 1 |
| Carestream | 1 | 1 |
| Caret | 1 | 3 |
| Caretakerr-Api Project | 1 | 1 |
| Carey Briggs | 1 | 1 |
| Carey Internet Service | 1 | 1 |
| Carglglz | 1 | 1 |
| Carlos Carvalhar | 1 | 3 |
| Carlos Desseno | 1 | 2 |
| Carlos Eduardo Sotelo Pinto | 1 | 1 |
| Carlos Sanchez Valle | 1 | 3 |
| Carlosfazenda | 1 | 1 |
| Carlosgavazzi | 4 | 10 |
| Carmelogarcia | 5 | 10 |
| Carnegie Mellon University | 3 | 10 |
| Caroline | 1 | 3 |
| Carrcommunications | 2 | 14 |
| Carrental Project | 1 | 1 |
| Carrier | 12 | 80 |
| Carrierenterprise | 1 | 1 |
| Carrierwave Project | 1 | 3 |
| Carrot Cartoon Book Coin Project | 1 | 1 |
| Carrrot | 1 | 1 |
| Cars Portal | 1 | 1 |
| Cars-Seller-Auto-Classifieds-Script Project | 1 | 1 |
| Carscripts | 1 | 1 |
| Carsen Klock | 1 | 1 |
| Carson-Saint | 1 | 4 |
| Carspot Project | 1 | 1 |
| Carsten Haitzler | 1 | 1 |
| Carsten Wulff | 1 | 1 |
| Cart-App | 1 | 1 |
| Cart66 | 1 | 2 |
| Cartflows | 1 | 4 |
| Cartit | 1 | 1 |
| Cartkeeper | 1 | 3 |
| Cartoken Project | 1 | 1 |
| Cartpauj | 2 | 6 |
| Carts.Guru | 2 | 2 |
| Cartwiz | 1 | 1 |
| Casap Automated Enrollment System Project | 1 | 11 |
| Casbin | 1 | 8 |
| Cascadesoft | 1 | 2 |
| Caseproof | 2 | 5 |
| Cash-Machine Project | 1 | 1 |
| Cashbackcomparisonscript | 1 | 1 |
| Cashbackmintable Project | 1 | 1 |
| Cashit | 1 | 3 |
| Cashtomer Project | 1 | 1 |
| Casier | 1 | 2 |
| Casinogame | 1 | 1 |
| Casinosoft | 1 | 2 |
| Casio | 1 | 1 |
| Casperjs | 1 | 1 |
| Cassianetworks | 3 | 6 |
| Cassiopeia | 1 | 1 |
| Cassproject | 1 | 1 |
| Castel | 1 | 4 |
| Castelle | 1 | 1 |
| Castillobueno | 1 | 1 |
| Castillocentral | 1 | 2 |
| Castlamp | 1 | 1 |
| Castle Rock | 1 | 1 |
| Castle Rock Computing | 1 | 2 |
| Castlehill | 1 | 1 |
| Castlenet | 4 | 4 |
| Castlerock | 2 | 8 |
| Castor | 2 | 2 |
| Castor Project | 1 | 1 |
| Castos | 2 | 8 |
| Castro Xl | 1 | 1 |
| Cat | 1 | 22 |
| Cat Runner: Decorate Home Project | 1 | 1 |
| Cat Soft | 1 | 2 |
| Catalin Florian Radut | 1 | 2 |
| Catalisgov | 1 | 1 |
| Catalooksupport | 1 | 1 |
| Catalyst | 1 | 1 |
| Catalyst-Plugin-Session Project | 1 | 1 |
| Catalyst-Plugin-Static-Simple Project | 1 | 1 |
| Catalystconnect | 2 | 3 |
| Catapultsoftware | 1 | 2 |
