web conference, teleconference

http://bestwebconference.com/en/software-services/web-conferencing/read/gatherplace-cost-effective-when-many-presenters-share-a-license/
http://bestwebconference.com/en/software-services/web-conferencing/read/the-editors-choice-best-of-breed-web-conference-software/?sid=_501pUMtq7pp7BFCz0v9xGraZoTX96U

https://www1.gotomeeting.com/en_US/pre/productOverview.tmpl

http://www.adobe.com/products/acrobatconnectpro/

http://reviews.cnet.com/4520-6454_7-6212812-1.html