Tree Notebook is described as 'hierarchical notes manager designed for keeping personal information' and is an app in the office & productivity category. There are more than 25 alternatives to Tree Notebook for a variety of platforms, including Windows, iPhone, Linux, Online / Web-based and Mac. The best alternative is Microsoft OneNote, which is free. Other great apps like Tree Notebook are Evernote, CherryTree, Cryptee and ResophNotes.
This program is a structured notetaking application based on GTK+ 3. Write your notes in instantly-formatted Markdown, organise them in a tree of folders that can be instantly navigated from within the program, and add hand-drawn notes by mouse, touchscreen or digitiser.