- CacheFly LLC
- CACI International Inc
- Cactus Commerce
- CAD MicroSolutions Inc
- Cadatasoft, Inc.
- Cadcorp
- CADDS-1
- Cadence Design Systems
- Cades Digitech Pvt Ltd
- CadFaster Oy.
- CADKEY
- CADO Systems
- Cadsoft Corporation
- Cadweb
- Caere Corporation
- CAIS Software
- Cakewalk Music Software
- Cakewalk, Inc
- Cal Net Technology Group
- CAL-Q-TAX calculator by Texas Instruments
- Calcolatoria by Nicola Marras
- Calcomp
- Calculator Reference at Vcalc.net
- Calculator Software at Calculator.org
- Caldera, Inc.
- Calfax Bag-A-Tel Ep-800
- Calfax, Inc.
- California Pacific Computer Company
- California Software
- California State Archives
- Caligari Corporation
- Caliper Corporation
- Calista Technologies
- Callan Data Systems
- CallidusCloud
- CallPlus
- Callware
- Calma
- Calsoft
- CalTech
- Calvert Technologies
- Calvin (Kelly) C. Gotlieb
- Calvin Northrup Mooers
- Calypso Technology
- Calyx Software
- Camber Corporation
- Cambex Corp
- Cambium Learning Group
- Cambridge Technology Partners
- CambridgeSoft
- Cameleon Software
- Camelot Information Systems Inc
- Cameo Solutions, Inc.
- Camera Bits, Inc.
- Camfrog Video Chat
- Camilion Solutions
- Camino
- Campana Systems Inc
- Campus Management Corp
- Campus Quad, Inc.
- CampusTap
- Camputers Ltd.
- Camputers Lynx 48
- Camputers Lynx 96
- Camputers Lynx Disk Drive Unit
- Camputers Lynx-128
- Camshare
- Camstar Systems, Inc.
- CamStudio
- CamStudio
- Camtasia Studio
- CAN Telematics
- Canadian Data Preserve Inc
- Canadian Tire
- Canadian Tire Video Sports 84-6072
- Canary Communications
- CANCOM SE
- Canidium
- Canneverbe Limited
- Canning Fok
- Canon 8-T
- Canon AS-100
- Canon BJ-10E
- Canon BJ-10EX
- Canon BJ-20
- Canon BJ-30
- Canon BJ-5
- Canon BS-121
- Canon BX-3
- Canon Canola L-20 II
- Canon Canola L-3
- Canon Canola L100
- Canon Canola L100A
- Canon Canola L100S
- Canon Canola L1010
- Canon Canola L121
- Canon Canola L1210
- Canon Canola L121F
- Canon Canola L1632