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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.
We just had a look at Twitch Studio for the first time. We've been using OBS so far. It looks like Twitch Studio is closed source and Twitch doesn't have a way for the community to release plugins for it. Twitch Studio is an Electron app, so I was able to reverse-engineer the source code by using asar, but unfortunately Twitch obfuscated all the code which makes it very hard to understand what's going on. Looks like we'd have to wait until Twitch Studio brings official support for developer plugins... (I hope our analysis is right, please correct us if not.)