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adapt_authoring
A server-based user interface for authoring eLearning courses using the Adapt framework.
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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.
Hi! Aside from the kinda complicated download process and the server cost to run it (like five dollars or so?) I find the Adapt authoring tool to be pretty easy to use and with minimal CSS knowledge, you can make something pretty gorgeous. A few good assessment tools for interactivity, plus SCORM support. (I got a software dev friend to get the server running for me, that helped)