| ID | Name | Type |
|---|---|---|
| #18548 | Ciruelo Cabral | + |
| #2549 | Citadel Products | Z |
| #17139 | Citisoft | R |
| #2550 | Citizen Software | Z |
| #2551 | CityAceE | ? |
| #2552 | Ciudadela Software | Z |
| #2553 | Cj Echo | - |
| #2554 | Cj.Le0 | ? |
| #19648 | Ckazka Entertainment | P |
| #17140 | Claire's Computers | S |
| #23234 | Clanbyte | P |
| #16101 | Clare Edgeley | + |
| #16102 | Clare Gurton | + |
| #2555 | Clare Spottiswoode | ? |
| #17141 | Clarence Computers | A |
| #19540 | Clarity Software Ltd | Z |
| #2557 | Clas Kristiansson | ? |
| #2558 | Clasic | ? |
| #2559 | Clasic Software | Z |
| #2560 | Class Games | Z |