I haven't seen it mentioned, but a great option that I've used a few times before is Mirotalk. There's two versions, Mirotalk SFU and Mirotalk P2P.

Mirotalk SFU uses a central server where your stream can be sent to, and you'll receive others' streams from that same server. Mirotalk P2P, as expected is P2P with WebRTC, and doesn't require a server (other than the website your watching from). The only downside with the P2P is that it doesn't handle a lot of users in a single call very well.

Mirotalk is open source, doesn't require an account, and has nice features like built-in chat, whiteboard, file uploads, and the ability to play YouTube videos directly from the web client.

Link to Mirotalk SFU: https://sfu.mirotalk.com/

• Source Code: https://github.com/miroslavpejic85/mirotalksfu Link to Mirotalk P2P: https://p2p.mirotalk.com/
• Source Code: https://github.com/miroslavpejic85/mirotalk