1 OpenVCS - Open Source Video Conferencing Server
it is used as Multipoint Control Unit (MCU) manager. The application can managed any number of MCU (a.k.a Bridge) where each
Bridge can support up to 64 participants.
it is deprecated , but believed there will be another software to replace it.
2. openMCU
IT is called openh323, it doesn't support SIP.
http://sourceforge.net/projects/openh323/files/openmcu/
3.
MCU Media Server
murillo128
SIP Video Multiconference Media Server with WebRTC support.
http://sourceforge.net/projects/mcumediaserver/