BigBlueButton

BigBlueButton is a free software web conferencing system for Linux servers. Its intended use is online learning. BigBlueButton is an affiliate member of the Open Source Initiative.
Features.
BigBlueButton offers certain core features including:
Certain use cases are intended for teachers using the software, including:
BigBlueButton is a pure HTML5 client; no application is required to use it.. It uses the browser's support for web real-time communications WebRTC to send/receive audio, video, and screen.
Architecture.
As a web page application, BigBlueButton front-end uses React and the backend uses MongoDB and Node.js. It also uses Redis to maintain an internal list of its meetings, attendees, and any other relevant information.
The BigBlueButton server runs on Ubuntu 16.04 64-bit and can be installed either from packages or install script. There is work underway to move to Ubuntu 18.04 in BigBlueButton 2.3.
Security.
In October 2020 the German tech news portal golem.de published an article about several vulnerabilities in BigBlueButton. They criticized the unsafe use of LibreOffice, cookies without secure-flag and the use of old Ubuntu and Node.js versions. "I found a bunch of other security issues in BigBlueButton and proposed some hardening changes." wrote Hanno Böck. "This took a lot of back and forth, but all significant issues are resolved now."
History.
In 2007 the project was started at Carleton University by the Technology Innovation Management program.
The first version was written by Richard Alam (it was initially called the Blindside project) under the supervision of Tony Bailetti.
In 2009 Richard Alam, Denis Zgonjanin, and Fred Dixon uploaded the BigBlueButton source code to Google Code and formed Blindside Networks, a company pursuing the traditional open source business model of providing paid support and services to the BigBlueButton community.
In 2010 the core developers added a whiteboard for annotating the uploaded presentation. Jeremy Thomerson added an application programming interface (API) which the BigBlueButton community subsequently used to integrate with Sakai,
 WordPress, Moodle 1.9, Moodle 2.0, Joomla, Redmine, Drupal, Tiki Wiki CMS Groupware, Foswiki, and LAMS. Google accepted BigBlueButton into the 2010 Google Summer of Code program. To encourage contributions from others, the core developers moved the source code from Google Code to GitHub. The project indicated its intent to create an independent not-for-profit BigBlueButton Foundation to oversee future development.
In 2011 the core developers announced they were adding record and playback capabilities to BigBlueButton 0.80.
In 2020 the project released BigBlueButton 2.2, a full rewrite of the client and server to support HTML5.
In March 2020 BigBlueButton 2.2 was awarded by the ENTD – National Body for Digital Transformation as the best web conferencing system and used in the project UNIOPEN approved by the European Commission for Digital Skills and Job Coalition action plan.
The BigBlueButton name comes from the initial concept that starting a web conference should be as simple as pressing a metaphorical big blue button.
Adoption among non-profits.
In 2020 BBB has been adopted by many FLOSS focused non-profits including Wikimedia Australia, Constant vzw and new FLOSS focused coops like Catalan's The Online Meeting Cooperative.