- Century Media
- CloudCannon
- C3
- Code School
- Camcor.com
- Classical Academic Press
- CCB License
- Calvert Homeschool
- Curriculum Associates
- Countly
- Crytek
- Cognixia
- CSG
- CIPHR
- Ceipal
- ClearCompany
- Cobweb Security
- Coffee and a Classic
- Clipp
- CA Lottery
- Creddle
- Capstone Resumes
- CV Owl
- CareerOneStop
- Cbox
- Converge Pay
- Creaza
- Coastal Living
- Crucial Hosting
- Colophon Foundry
- Coverr
- CSS Gradient
- Chartable
- Castro Podcast Player
- Chaordix
- Chameleon
- Culture Amp
- Coderpad
- Chatfuel
- Cloudbeds
- CakeResume
- Chilliapps
- Cypress.io
- CometChat
- Chorus.ai
- Concepts App
- CaringBridge
- Club Z
- Cupcake Trainings
- Career Builder
- CryptPad
- Copper
- Canto
- Cincinnati
- Courier-Journal
- Chicago Sun-Times
- Chattanooga Times Free Press
- City A.M.
- Casinority
- Caesars Games
- Casino Cruise
- Contest Girl
- Code Kingdoms
- City Lights
- Crush.pics
- CopyCrafter
- ChurchThemes.com
- Cockroach Labs
- Couchbase
- Compose.io
- Comarch
- Campus Shoes
- ChangeTower
- Centmin Mod Nginx Test Page
- Cardknox
- Chineasy
- Clayton State University
- CodeAvail
- Cheetah3D
- CartoonCrazy.net