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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
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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.
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cMenu-Plugin
An Obsidian.md plugin that adds a minimal text editor modal for a smoother writing/editing experience ✍🏽.
Its not free, but Obsidian fits your requests -- https://obsidian.md/
I also create a lot of txt note files on different devices/operating systems and always struggled with syncing them across my devices/OS’s. The app that I found to be the answer was Joplin - I’m not too sure if it fits your needs but I recommend trying it if you haven’t. And it’s free.
obsidian-editing-toolbar https://github.com/cumany/obsidian-editing-toolbar