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WebHuddle takes some work to set up, but can provide group conferencing that is comparable to many very expensive solutions. The server software can be hosted on your own computer.

Installation

To install the server, first install pre-requisites, including Java, JBOSS Application Server, and xvfb.

sudo apt-get install sun-java6-jre sun-java6-jdk jbossas4 xvfb