[elcapitan]

Joplin works well for me, I started using it as an Evernote replacement half a year ago. It's open source, has markdown, syntax highlighting for many languages, comes with a mobile and desktop app and syncs via various services, e.g. Dropbox.

[hummerbliss]

+1 for Joplin, I use it for logging my work day. I dump the information in JIRA task I work on and have highlights and other related notes in Joplin, although I wish Joplin has a native support for calendar (similar to https://zim-wiki.org).

[Pabblo001]

+1 for Joplin - works much faster vs Evernote, and also got awesome plugins (including backlinks like obsidian)

[PikachuEXE]

+1

Mind you that the notebooks seem to be actually "categories".

One notebook can be dragged into another to create trees.

[elcapitan]

Ah, haven't even tried that one yet, that's helpful to know!