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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.
Should the Dlang people decide to offer their D2, this project willl have a hard time to be found on the net.
(I did Moniel, which is bit similar, but the use case was somewhere else. I always applaud such tools. Awesome work!)
Reminds me of https://penrose.cs.cmu.edu/ that I worked on
PlantUML is way more than just UML diagrams
Reminds me of a similar language I created as a personal project. Mine's open source - https://github.com/gulbanana/thousand, with a live preview here - https://thousandwords.azurewebsites.net/ - but it definitely doesn't have the bidirectional IDE! That's a really nice tool.