If you are a school, tutorial, gym, teacher, or belong to another activity that has been stopped by COVID-19 and lock down but you could continue your activity online, have a look at BigBlueButton
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The BigBlueButton is an open source program for web conferencing. It is based on the GNU/Linux operating system and runs on Ubuntu 16.04.
In addition to the various web conferencing services, it integrates many of the major learning and content management systems. The latest version of BigBlueButton is version 1.1.
BigBlueButton supports multiple audio and video sharing capabilities, presentations with extended whiteboard capabilities - such as pointing, zooming and drawing - public and private chat, desktop sharing, built-in VoIP using the FreeSWITCH and support for presenting PDF and Microsoft Office documents. In addition, users can enter the conference in one of two roles: viewer or moderator.
As a viewer, a user can join the voice conference, share the camera, raise their hand and chat with others. As a moderator, a user can mute other users, kick any user from the conference, and make any user the current presenter. The presenter can load slides and control the presentation.
Although its components are open source, the BigBlueButton client depends on a browser plugin for the Adobe Flash platform. The BigBlueButton server runs on Ubuntu 10.04 64-bit and can be installed either from source or from Ubuntu packages. BigBlueButton is also downloadable as a Virtual Machine (VM) that runs inside VMware Player on PC and Unix computers and inside VMWare Fusion on Mac. The BigBlueButton server can also run within a cloud environment, such as Amazon EC2, by installing it on an Ubuntu 10.04 64-bit instance.