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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.
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KeenWrite
Discontinued Free, open-source, cross-platform desktop Markdown text editor with live preview, string interpolation, and math.
On a related note, I did some work on generating temporal graphs from text: https://arxiv.org/pdf/2010.10077.pdf
Code/models: https://github.com/madaan/temporal-graph-gen
Kroki.io is integrated into the text editor I've been developing:
https://github.com/DaveJarvis/keenwrite#screenshots
Would configuring it to use a local Kroki install be useful?