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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.
I have been working on a new medium used just for guiding viewers through code examples. It combines the best of books, blog posts, and videos. This new medium allows a developer to write code using a top-notch editor (Visual Studio Code) and then replay the development of that code in the browser. The author can add comments at important points in the evolution of the code and publish the resulting code 'playback' on a web server. The comments can include text, hand drawn pictures, screenshots, and audios/videos. The tool is called Storyteller.