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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Check out https://peerjs.com/. It's a good library, especially for one-on-one calls. It's P2P. When you start adding more users, it does tend to cause some performance issues, but it works well for smaller projects.
If you require large audiences to be able to view the same stream, check out MediaSoup (https://mediasoup.org/) - this is a little bit more involved and requires a server to relay media streams, but it is capable of handling an application of that size.