What about not only the teacher helping the students, but the students also helping each other? And each question can get it's own topic -- there's a chat but

What about not only the teacher helping the students, but the students also helping each other? And each question can get it's own topic -- there's a chat but it need not be used for everything? And, an open source platform? A university can choose to install on their own server. Then have a look at Talkyard: https://www.talkyard.io/use-cases https://www.talkyard.io/use-cases (I'm developing it)