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.
Siyuan. Ive been using it for a while now and find it very effective for my needs. Its gone through quite a few updates since i started using it and became open source in that time. It even has an android version as well which i do have installed on my phone but admittingly rarely use. I prefer writing information on a keyboard generally.