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obsidian-latex-suite
Make typesetting LaTeX as fast as handwriting through snippets, text expansion, and editor enhancements
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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.
in contrary I prefer ipad in any possible way over epaper device. I use browser to solve leetcode, r/obsidianMD to write notes on the keyboard, I learned touch typing especially for that to be more productive. to organize my notes I use r/Zettelkasten in obsidian with lots of tags and other stuff. for math obsidian has for example latex plug-in