Letter C
| CAT | 3 projects |
| cat-v.org | 1 project |
| Catalan | 157 projects |
| Catalan (Valencia) | 3 projects |
| catalog | 8 projects |
| Catalyst | 3 projects |
| categories | 1 project |
| CATIA | 1 project |
| cavity | 1 project |
| Cayenne | 1 project |
| CBR | 1 project |
| CBZ | 1 project |
| CC-BY | 3 projects |
| CC-BY-NC 3.0 | 4 projects |
| CC-BY-NC-SA | 2 projects |
| CC-BY-NC-SA 3.0 | 1 project |
| CC-BY-SA | 4 projects |
| CC-BY-SA 3.0 | 3 projects |
| CC-GNU LGPL | 1 project |
| CC3.0 | 1 project |
| CCITT | 1 project |
| CCL | 1 project |
| ccms | 1 project |
| CCTV | 2 projects |
| CD | 1 project |
| CD Audio | 238 projects |
| CD Playing | 49 projects |
| CD Ripping | 103 projects |
| CD Writing | 79 projects |
| CD-Based | 114 projects |
| CD/DVD | 1 project |
| Cdarts | 1 project |
| cddb | 2 projects |
| CDDL | 49 projects |
| cdf | 1 project |
| cdg | 1 project |
| CDI | 1 project |
| CDMA | 1 project |
| cdn | 2 projects |
| CDN Application GUI | 1 project |
| cdparanoia | 2 projects |
| cdr | 1 project |
| CDROM | 1 project |
| CeCILL | 29 projects |
| CeCILL-C | 3 projects |
| cego | 1 project |
| cegui | 1 project |
| cell phone | 1 project |
| cellar | 3 projects |
| cellphone | 2 projects |
| cellular | 2 projects |
| cellular automata | 2 projects |
| cellular automaton | 1 project |
| CELT | 1 project |
| Celtic knot | 2 projects |
| CEM | 1 project |
| censorship | 1 project |
| census | 1 project |
| CentOs | 28 projects |
| CentOS-6 | 1 project |
| central | 1 project |
| Central Configuration | 1 project |
| Central Khmer | 1 project |
| central project repository | 1 project |
| central reservation system | 1 project |
| Centrallix | 1 project |
| cep | 3 projects |
| Certificate | 2 projects |
| Certificates | 2 projects |
| certification | 1 project |
| Certification Authority | 1 project |
| cfa | 1 project |
| CFD | 3 projects |
| CFEngine | 1 project |
| cfg | 1 project |
| cfi | 1 project |
| cgi | 25 projects |
| CGI Tools/Libraries | 798 projects |
| cglib | 1 project |
| cgroups | 1 project |
| ChaiScript | 1 project |
| Champlain | 1 project |
| change ctime | 1 project |
| change management | 5 projects |
| change request | 1 project |
| change web page | 1 project |
| change website | 1 project |
| channel | 4 projects |
| channel manager | 2 projects |
| chaos | 2 projects |
| Character encoding | 1 project |
| charcoal | 1 project |
| charity | 3 projects |
| chart | 17 projects |
| chart grids | 1 project |
| chart layouts support | 1 project |
| chart-library | 3 projects |
| Charting | 2 projects |
| charting control | 3 projects |
| charts | 16 projects |
