| Company Name | Software Titles |
|---|---|
| Conveyor Dynamics | 1 |
| Conviva | 1 |
| Convivea | 1 |
| ConWare | 2 |
| COOL.STF | 2 |
| CoolDev.Com | 1 |
| Cooliris | 2 |
| Coolite | 1 |
| CoolTrade | 1 |
| CooolSoft | 3 |
| Copeland Energy | 1 |
| Copernic Inc. | 1 |
| Cor Berrevoets | 1 |
| Corda Technologies | 1 |
| Core Mobility | 1 |
| Core Services | 2 |
| Core Software Solutions | 1 |
| Corel | 222 |
| Coremetrics | 4 |
| CoreStreet | 1 |
| Corex Technologies | 1 |
| Corillian | 3 |
| Corillian-CBGroup | 1 |
| Cornell University | 3 |
| Cory Plotts | 1 |
| Cosmi | 19 |
| Costco Wholesale | 1 |
| CounterPath | 3 |
| CounterSoft Limited | 1 |
| Coupons | 2 |
| Coupons.com | 3 |
| Couponstar | 1 |
| Course Technology | 1 |
| Covad Communications | 1 |
| COWON | 5 |
| Cozi | 2 |
| Cozi Group | 2 |
| CozyRoc | 1 |
| cPaperless | 1 |
| cpatch.org | 1 |
| CPR | 2 |
| CPT | 1 |
| CPU Monitor v. | 1 |
| CQG | 2 |
| CRA | 1 |
| Craftsman Book Company | 3 |
| CraigsPal | 1 |
| Crain Communications | 1 |
| Craneware | 3 |
| Cranium Consulting and Custom Software | 1 |