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goldensun_html5
An online Golden Sun Engine entirely built in HTML5 with Phaser 2. Check https://gshtml5.org/
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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.
Here are some updates of GSHTML5. Here is the online demo (please use a Chrome-based browser) and here is the list of things that still need to be done. Detailed info about the engine, you can find here.
There's no editor right now. Everything is defined in JSON files (example of a JSON file). The only exception is for maps, that you can use Tiled for doing them.