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.
I am not trying to defend Obsidian here in regards to its closed source but in the least the notes are not obscured in some database and use markdown format. So once they go away from that, I am out and still have all my notes accessible.