- Conspiracy Entertainment
- Core Design
- Craft&Design
- Cake Masters
- Coastal HR
- Checkmate Payroll
- Cube19
- Chasma
- Compport
- CommonOffice
- CWS Software
- CompensationXL
- CBR Human Resources
- CA HR Services
- CiviHR
- ConnX
- CanadianAlien.com
- CentreSoft
- Cap'n Games
- Cybertron Video Games
- Cyber-Fortress
- CyberAlpha
- ChineseBookie
- CarbonGaming
- CRsportsBet
- Copycats Media
- Click Scan Share
- CD-Crafters
- Cassini Maps
- Carcanet Press
- Caister Academic Press
- Cork University Press
- Cedar Publishing
- Cypress House
- CEU Press
- CoachCrate
- Chocolate and book
- Comic Mystery Box
- Crate Expectations
- Chrome Remote Desktop
- CVMaster
- Conservative Jobs
- ChatFlow
- Cugic
- Cention
- Chat Outsource
- ChatShipper
- Chataroo
- CareCall
- Chat For Charities
- Chatooly
- ChatWare
- ChatrHub
- CosmoBots
- Connex One
- Cosurfing
- Cadalys
- CustomerWise
- Chorally
- Cyfeon
- CustomerFirst
- Central Desk
- C-Desk
- Creoir
- Crescendo Systems
- Castel
- Complete Internet Solutions
- CORE Languages
- Clear Demand
- Call Journey
- Cobrebem
- ClearGate
- Cloud9 Payment Gateway
- Corduro
- Coriunder
- Commence Payments
- ChristianMate.com
- CountryMatch.com
- Chorus
- Culinary Friends