Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.

Tomboy - Apps/Tomboy - GNOME Wiki!

Zettlr - Write Markdown documents with a comprehensive GUI and many workflow/time management tools.

Turtl - The secure, collaborative notebook

Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.

Omni Notes - Note taking open-source application aimed to have both a simple interface but keeping smart behavior