Openmeetings - Open Source Web Conferencing

Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming. Meeting can be recorded and screen sharing support is also available.

Its feature include Private message center, User and room management, Multi-Whiteboard and Chat, User permission and Moderating System, Polls and Votes, Backup and lot more.