Hey! I develop multi room web conference systems and have worked with a couple of clients on another freelancing site, I will be happy to show you a demo, and the following are the features currently present on my application:
Website Based with login system
Audio/Video Multi party conference
Text chat within rooms
screen sharing on computers
file sharing between all participants
Room leader/moderator and viewers separation
Android PWA based app.
I would gladly convert this to a native android and iOS application, and once again, feel free to contact me for a demo.