"BigBlueButton is an open source project that is built on over fourteen open source components to create an integrated web conferencing system that runs on mac, unix, or PC computers. In the true sense of open source, we invite you to try out and participate in our project."
TeamViewer - the All-In-One Solution for Remote Access and Support over the Internet
TeamViewer establishes connections to any PC or server all around the world within just a few seconds. You can remote control your partner's PC as if you were sitting rig