| ID | Name | Type |
|---|---|---|
| #18560 | Cosmin Parligras | + |
| #20512 | Cosmium | P |
| #2808 | Costa Panayi | + |
| #17194 | Cotrel | R |
| #2809 | Cottage Computing | Z |
| #17195 | Cottage Software | S |
| #2810 | Cottbus | ? |
| #2811 | Courbois Software | Z |
| #2812 | Court Software | Z |
| #16110 | Courtney Castello | + |
| #2813 | Cowl Systems | Z |
| #2814 | Cox & Wyman Ltd | Z |
| #2815 | Coxsoft | Z |
| #2816 | Craccer Software Team | Z |
| #18161 | Crackfiend | + |
| #2817 | Cracking Software | Z |
| #19575 | Craig Bird | + |
| #21435 | Craig Breighner | + |
| #2818 | Craig Cole | + |
| #2819 | Craig Communications Ltd | Z |