QuantumCloud
- Offers customized databases, web and graphics design, multimedia ad making, and on and offline publishing.
- http://www.quantumcloud.com/

Quantum Information System
- Offers custom programming and database integration. Located in Maryland, United States.
- http://www.quantumtechee.com/

QC Media Visual Communications
- Video production, and web design and hosting; includes Flash, CD-Rom, VCD, DVD, Java, DHTML, audio and video streaming.
- http://www.qcmedia.org/

Quietsites
- Offering content management systems, e-commerce and database driven sites, plus custom windows applications and components.
- http://www.quietsites.com/

Quadsite
- London-based multimedia communications and design company.
- http://www.quadsite.com/

QMS Creatives
- Offers static and dynamic web design and promotion services.
- http://qmscreatives.com/

Quist Interactive
- Offers design, development, multimedia services, and e-learning development. Lake Zurich, Illinois, United States.
- http://www.quist.net/

QuirkWorks
- Graphics, animation, ecommerce solutions, maintenance and marketing packages available.
- http://www.quirkworks.com/