Blindside Networks started the BigBlueButton project, an open source web conferencing system for online learning
BigBlueButton enables instructors to engage and teach remote students in real-time. It is freely available (under an open source license), deeply integrated with Moodle (and embedded into Moodle Cloud), and supported by Blindside Networks.
With BigBlueButton you can provide your students virtual office hours, flipped classrooms, group collaboration, and full online classes. Your sessions can be recorded for later playback.
BigBlueButton is pure HTML5 — there is no plugin to install. Just click a link and it runs with your browser (FireFox and Chrome are best). Similarity, there is no app to install for mobile devices. It runs with Safari Mobile on iOS 12.2+ and Google Chrome on Android 6.0+.