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.
Markor + synvthing
Joplin uses it’s own database so interoperability is not perfect. Markor is so effing cool. That’s on Android. On the laptop I use want ever is best suited for the task. Most often, a vim variant of notepad++
https://github.com/gsantner/markor