Red5 open source Flash media server:

Red5 is an Open Source Flash Server written in Java that supports:
* Streaming Audio/Video (FLV and MP3)
* Recording Client Streams (FLV only)
* Shared Objects
* Live Stream Publishing
* Remoting (AMF)

Red5 can be download from:
https://code.google.com/p/red5/
or
 http://www.red5.org/


Apache OpenMeetings is based on red5:
http://openmeetings.apache.org/