Currently I’m using Joplin with Syncthing-backed file system synchronization. I’m pretty pleased with it, as I do like tagging- and Markdown-based systems.
I plan to upgrade to server-based synchronization, but before doing that, however, I wanted to see what other people are using.
Edit: So far I see a slight favor towards Joplin and Logseq, but I totally didn’t expect (and appreciate) getting so many different answers.
https://notion.so It’s a web-based editor with a good android app. Has basic formatting, plugins/integrations, and dark mode. It’s free for individual use cases. Has some nice paid features for collaboration and business use cases, though the free plan still allows sharing and concurrent editing.
E: noticed this is in self hosted after posting. Maybe not what you’re looking for, but it’s a good service if you’re ok with that.
Wish there was a self-hosted version of notion with all the same features
The closest is nextcloud collectives, tables, tasks and deck