Well, I've settled for Joplin with their sync server running on Tailscale/Headscale, I like it a lot (except for the search which is atrocious in general and on mobile especially).

I use joplin with nextcloud.

i use Joplin via nextcloud. It can also use Dropbox.

i also agree with another poster, search kinda sucks

If you want cross platform, Joplin might be best option right now. But I am keeping an eye on Beaver Notes.

Joplin

Joplin is solid and gets the job done. I was fine with it as a OneNote alternative but once I tried out Obsidian I understood immediately what all the hype is about Obsidian. Using links instead of the standard folder structure is much more intuitive and functional for me. I highly recommend Obsidian even though it isn’t FOSS, since they have a pretty good ethos on not being locked into specific apps, and all the notes are stored in text files so you could easily migrate in the future if you change your mind about Obsidian or if they as a company do something questionable.

I’ve heard of Logseq as a FOSS alternative to Obsidian and would consider looking into that too.

I like AnyType Its like Notion but Open Source, E2EE, P2P & Local first.

Logseq is also pretty cool. FOSS Alternative to Obsidian.

It you want very simple notes like Google Keep and you are into Selfhosting checkout Anchor (https://github.com/ZhFahim/anchor)

Nextcloud Notes covers all my needs.

I am loving Silverbullet. https://silverbullet.md/

Neutrinote is solid.

Notesnook

There’s Anytype, which is similar to Notion.

You can set it up to sync over lan only, with your own server, or with their servers. It’s E2E encryption

Don’t know if this find a lot of people or if it is still the greatest choice but I use Notesnook.

It's probably better for documentation but I use bookstack for everything

I used Joplin for a while and liked it for literature notes. Currently I use obsidian, but as I also use that for pen&paper notes I am thinking of going back to Joplin for academic stuff.

Quillpad

It is supposed to have a sync option but I don't care about that.

As others mentioned, Joplin is a solid option (with lots of plugins too). Notesnook too is good (if you're willing to pay a subscription). If you are willing to wait a bit, there's Beaver Notes. Currently they are working on syncing between devices and a new mobile client.

Joplin.

Silverbullet.md for actual notes with formatting and such.

Quillpad for checklists.

Emacs.

Logseq, Joplin, both synced via Filen.

Also still use Obsidian at work.

I'm a fan of all of them.

I use Quilpad.

Syncthing and anything that can work with plain text / markdown files

I'm using Logseq on 2 laptops, but the Android app slows down when you have several years of daily journal pages linked to hundreds of other content pages, so it's fine for personal stuff (aka graph), but slows down too much for my work stuff (graph)

So for my phone I'm often just using Markor to edit a journal page as it's faster (it doesn't have to find all the links)