BigBlueButton is a video conferencing software that allows you to hold virtual meetings or classes through Sakai. No account creation is required, simply add the "Meetings" tool to your Sakai site and create your first meeting. BigBlueButton supports multiple audio and video sharing, presentations with extended whiteboard capabilities - such as a pointer, zooming and drawing - public and private chat, desktop sharing, breakout rooms, integrated VoIP using FreeSWITCH, and support for presentation of PDF documents and Microsoft Office documents. Meetings can be recorded then shared via a link or downloaded; this includes the breakout rooms!
Take a look at the video demo of BigBlueButton and give it a try today.