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Outline
The fastest knowledge base for growing teams. Beautiful, realtime collaborative, feature packed, and markdown compatible.
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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.
As for tools, use what works for you. I like outline wiki (hey I wrote a guide on selfhosting that) as it has diagrams.net integration and can export to markdown.
In terms of diagramming, that's a skill on its own. Doesn't matter what tool you use (though I'm a fan of diagrams.net integrated into our wiki). I revert back to PowerPoint for a lot of them. Some tips: