我是怎么一步一步找到这里的？ jedox—jedox Webinars （不懂意思）--->google [ webinars open source ]，—>http://www.freshtechtips.com/2012/01/9-best-free-webinar-software-for.html---->在网页中搜 github/open/opensource/ open source
适合于做演示
bigbluebutton:http://bigbluebutton.org/videos/
bigbluebutton github(java):https://github.com/bigbluebutton/bigbluebutton
bigbluebutton安装手册(看完会学会很多)：http://docs.bigbluebutton.org/install/install.html
适合于针对某一系列主题进行讨论
openmeetings(java) :http://openmeetings.apache.org/