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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.
- Organisation of drafts (https://obsidian.md does this best)
- A decent mobile app, desktop app & web app that work well offline (https://obsidian.md also does this well)
- Ability to export to another platform (https://obsidian.md also does this well)
- Collaboration.
- Latex Support
- Mermaid Support
- Support for Idyll
- Support for embedded items i.e interactive charts.
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But here is the kind of platform that is really missing.
If I wanted to start a trade journal, niches news site or publication, digest. Like The Economist, Quanta, Architectural Digest, Deezen.
There is really not "go to" platform that caters for all these needs out of the box.
People often have to struggle with badly done custom solutions.