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.
Flatnotes for me. I haven’t tried many others, but it was perfect for what I needed. Markdown, writes plain text files so no database/easy to backup
I loved how easy it is to setup. Just was too minimal for my purpose though.