| ID | Name | Type |
|---|---|---|
| #16684 | Cristian M. Gonzalez | + |
| #2868 | Cristian Secara | + |
| #2870 | Cristiano Cremonini | + |
| #2871 | Cristina Marcos | + |
| #2006 | Cristoph Grewe | + |
| #22220 | Cristóbal | + |
| #2872 | Crocus Man | ? |
| #2873 | Crom Software | Z |
| #21982 | Cronomantic | P |
| #21963 | Crononomantic | P |
| #16010 | Cronos Software | P |
| #2874 | Cronosoft [ES] | Z |
| #2875 | Cronosoft [UK] | Z |
| #2876 | Cropthorne Software | Z |
| #2877 | Cross Software | Z |
| #2878 | Cross Technics | Z |
| #2879 | Crow | ? |
| #17198 | Crown Software | S |
| #2880 | Crowther & Woods | Z |
| #2881 | Crusader Computing | Z |