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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.
There’s Marktext [0] that has a pleasant, feature rich and has a minimalist UI.
[0] https://github.com/marktext/marktext
I'm the founder of a beautiful Markdown editor. Actually two:
Nota - https://nota.md. It's a notes app but a lot of our users use it as a markdown editor. Nota is quite powerful as a markdown editor. It has a lot of smartness built into it.
Caret - https://caret.io. We started with this - a beautiful Markdown editor. We aren't implementing new features for it but if you are on Windows or Linux it might be worth trying out. We still have new users coming in.
A common feature of the two is that they both are pleasant to use. We've put a lot of hard work in the UX (which is also hard to market and one of the reasons why you probably haven't heard about us).
I enjoy Obsidian [1] daily. Perhaps more than a minimal editor, but very powerful overall.
[1] https://obsidian.md/
When not using VSCode + preview, I have found https://dillinger.io/ pretty good as you can download the result in various formats.
I’m working on https://github.com/thien-do/samuwrite :D it’s typography from iA Writer + vscode editor (monaco). You can try it on samuwrite.com. It also has a mac app.