From CDOT Wiki
After that, the resources you will need will depend on which parts of BigBlueButton you want to develop.
For the steps on setting up a BigBlueButton version 0
.90 development environment for the server, and for the Flash client, see https:// code. google. com/ p/ bigbluebutton/wiki/090Developing.
For the steps on setting up a development environment for the HTML5 client, see http://docs.bigbluebutton.org/html/html5-dev.html