eslint-plugin-compat VS xournalpp

eslint-plugin-compat [0] and stylelint-no-unsupported-browser-features [1] can help you know when you're using an unsupported browser feature.

[0] https://github.com/amilajack/eslint-plugin-compat

For now I'm trying to set up [eslint-plugin-compat](https://github.com/amilajack/eslint-plugin-compat) to check it for me, but I'm not sure it works — get 0 errors and 3 polyfills for a test snippet.

I like Rnote and Xournal++. Not sure if they fit your needs, though. I always use them with a digitizer, but you can also write text with the keyboard.

That's how most freeware works. You must look for free AND open source. If it's just free but not open source then the developer is likely to have ulterior motive. Try Xournal++. It looks like it can do what you are wanting. If they won't show you the source you should consider it practically malware.

xournalpp is pretty good

I normally take Markdown notes with quick sketches from time to time with a Wacom tablet. I've used Xournal++ and Marktext to do all this, exporting my sketches into image files and inserting them into Marktext. However, I am starting to feel fatigued with this workflow and I discovered that Obsidian and the Excalidraw plugin could be an all-in-one solution for what I do, instead of having to work between two apps and exporting my sketches manually.

I know many people who used OneNote on Windows and now use Xournal++ on Linux for the same usecase: https://xournalpp.github.io/

For ToDo, well, there's plenty of options. But, I have heard that Xournal++ (https://xournalpp.github.io/) is pretty decent alternative for OneOnote. I should state that i myself have not used it (nextcloud notes suffices for my work flow). But, many others rave about this.