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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.
Agreed -- Excalidraw is also awesome! Link for the lazy:
https://excalidraw.com
They do have reusable sets of diagrams now, they're called "libraries":
https://libraries.excalidraw.com
I've been using a system called PlantUML for a while that allows you to create diagrams using plaintext, there are plugins for VSCode and Word and support in Gitlab is available:
https://plantuml.com/
https://www.planttext.com/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.