LifeSize is the first company to develop and deliver high definition video conferencing products.
Here are few videos that showcase the technology.

ClearOne Communications leading global provider conference phones, professional audio, conferencing systems, installed audio conferencing solutions.

Lightspeed is the Trusted Provider in Classroom Audio Technology. Sound field Classroom Audio Systems improve student achievement.

Qwizdom is a market leading provider of Audience Response Systems, sometimes referred to as Electronic Voting Systems or Audience Clickers.

We make natural video communication available to everyone—from the office, home or while traveling—over general purpose IP networks, including the Internet. Vidyo has made telepresence-quality video conferences easy and affordable on PCs, Macs and HD room systems..