C-Media
Cabletron (now Enterasys) - Firmware & Release Notes
CalComp (GTO CalComp)
Canon
    Canon - Canon USA
    Canon - Canon Europe
Canopus
Cantata Technology
CARDEXPERT (Gainward)
CardScan
Carroll Touch (now ELO TouchSystems)
    Carroll Touch (now ELO TouchSystems) ?Drivers
    Carroll Touch (now ELO TouchSystems) ?Manuals
Casio
    Casio - Casio (US)
    Casio - Casio (UK)
Cellvision Systems
Chaintech
    Chaintech - Accessories Card Driver
    Chaintech - BIOS
    Chaintech - Drivers for Motherboard
    Chaintech - IMO Desk Drivers
    Chaintech - Manual
    Chaintech - Memory Compatibility List
    Chaintech - Software for Digital Media
    Chaintech - Utility
    Chaintech - VGA Card Driver
CHEM USA
    CHEM USA - BIOS updates
    CHEM USA - Drivers
Chic
Chinon
Chips Technology (now Intel)
Cirque (now Alps Electric)
Cisco
CITEL Technologies
Citizen
Clevo (also Kapok laptops)
CNet Technology
    CNet Technology - Drivers
    CNet Technology - Firmware upgrades
    CNet Technology - User Guide & Manual
ColorSpan (now MacDermid ColorSpan Inc)
Compaq (part of Hewlett-Packard)
Compex
    Compex - Drivers
    Compex - Manuals
Compuprint (CPG)
    Compuprint (CPG) - Drivers
    Compuprint (CPG) - User Manuals
Comtrend
Connect3D
Conexant/Rockwell (Brilliant source for all Conexant/Rockwell Modems)
Contour Design
CoStar (Now Dymo)
CPG
    CPG - Drivers
    CPG - User Manuals
Creative Labs (UK)
Creative Labs (US)
Cristie
Cyber Power Systems
CyberVision (now ViewSonic)
    CyberVision (now ViewSonic) - Drivers & Utilities
    CyberVision (now ViewSonic) - User Guides