I am the product manager for BigBlueButton. While we implement most of the capabilities you would expect in a web conferencing system, we focus on giving the instructor many ways to engage students for learning. Being open source has enabled many schools around the world to setup and run their own BigBlueButton servers. Thanks to our community, we're localized in over 25 languages, provide a pure HTML5 interface, and have been deeply integrated into many of the most popular learning management systems. Our road map will continue of focus on the teacher/student engagement. Needless to say, Covid-19 made a lot people take a closer look at BigBlueButton. We've been working on it for 10+ years now, and we're very determined to make it the most effective platform for virtual classrooms and build upon our community.