http://www.raindance.com
2. PlaceWare
http://www.placeware.com
3. Centra
http://www.centra.com
4. Contigo
http://www.contigo.com
5. WebEx.com
http://www.webex.com
6. SiteScape
http://www.sitescape.com
7. Netmosphere
http://www.netmosphere.com
8. eRoom
http://www.eroom.com
9. Parlano.com
http://www.parlano.com
10. Cubus
http://www.cubus.net