If you are looking for a handwritten notes app that syncs across devices you could give Saber a try.
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Not a great direct alternative, but rnote is pretty good
Creating a TiddlyWiki is also an alternative. Especially to Obsidian
I dunno if this is weird or what but personally I can't stand markdown editors. It's 2023 and Microsoft Word is a fairly polished thing that I expect replicated in some way in my note taking app.
Currently I'm using Notion and it's pretty nice. Free for students too which is great.
I was using Wiki.js which was nice but a bit clunky and I ran into a few showstopper bugs that I couldn't bother fixing.
@Maxcoffee that's understandable. My boss also hates Markdown. It's not for everyone. I like how lightweight it is, how many things support it, the inline formatting, portability, etc.
Like I said though, it's definitely not for everyone.
My biggest pet peeves is partial support for markdown.
I use qownnotes in combination with nextcloud. Supports mark down, git like history and syncing with the nextcloud notes app, which you can also use on your phone.
Create a folder, put markdown files in it, sync* and backup* the folder however you like and edit the files with whatever you like*.
Within my folder I have a daily journal - start each day with a list of what I hope to achieve today and make notes throughout the day as I progress on those tasks. The next day that journal becomes something I'lll refer back to in the morning to decide what to do next. Depending on the project - weekly or monthly might be more suitable than daily. Or maybe something else entirely.
I also have folders an files for longer term tasks.
If you want to collaborate, make a second folder and choose a sync platform you can all agree on.
(* I use GitHub for Sync, Backblaze B2 for backup, and Visual Studio Code for editing, with extensions for markdown and making GitHub a little easier... specifically GitDoc for auto-commit/push/pull and Markdown All in One for formatting/etc. Also Copilot is handy for some note taking tasks. The "foam" extension mentioned here looks like it might be great too)
Notesnook is a pretty good service. More of a less clunky Evernote. It's free by default but has paid for options and also very privacy focused.
If you're looking for touch/stylus compatibility I highly recommend the Excalidraw plugin for Obsidian.
I’ve tried about everything and landed on Workflowy and love it. Simple, fast, excellent for organizing.
Zettlr.