BigBlueButton is a free video conferencing tool that any school can install and configure for local staff use. BBB integrates with most Learning Management Systems seamlessly, making it easy to setup and use for online collaboration and teaching. It has all the tools and features that a teacher would want, save one. BBB does not allow you to download of the recorded video files. You could use something like OBS Studio to capture it later, but that is an additional step that other options (like Zoom) do not require. The files are automatically posted in the LMS (if you record them) for easy reviewing by students.