You should definitely give a try to https://duckly.com/ https://duckly.com/ - it has real-time integrations to different IDEs but it also has a Web IDE in case

You should definitely give a try to https://duckly.com/ https://duckly.com/ - it has real-time integrations to different IDEs but it also has a Web IDE in case the students don't have the IDE integration. Besides that, it also has other cool things that may be very useful for your use-case like: terminal sharing, audio/video chat, simple unique urls that you can share, presence to see who's on a room, URLs to join a call/session without an account, Chrome Extension for sharing webpages, etc. (Disclaimer I'm the founder of Duckly)