keepnote

keepnote [notebook_path]

notebook_path
    The path to the notebook file to open. If omitted, KeepNote will open the last used notebook or prompt the user to create or select a notebook.

KeepNote is a feature-rich note-taking application designed for Linux, Windows, and macOS. It allows users to organize notes in a hierarchical notebook structure, similar to a folder system. Notes can contain rich text formatting, including headings, lists, tables, images, and file attachments. KeepNote uses a simple file format (XML and supporting files), making it easy to back up, restore, and move notebooks. It supports full-text searching, allowing users to quickly find specific information within their notes. KeepNote is especially useful for developers, researchers, students, or anyone who needs a versatile and organized way to manage information. It offers features like syntax highlighting for code snippets and supports cross-linking between notes. The application provides an intuitive interface that fosters productivity and reduces clutter.

KeepNote is no longer actively developed, and while it's still functional, users might encounter compatibility issues with newer operating systems or file formats. Alternatives may offer better support for cloud syncing and collaboration.

KeepNote stores notes in a directory structure. Each note is saved as an XML file, and any attachments (images, documents, etc.) are stored in the same directory. This flat-file approach makes it easy to backup the entire notebook by simply copying the notebook directory.

KeepNote is available through some Linux distribution package managers.
For example:
Debian/Ubuntu: sudo apt install keepnote

KeepNote was developed as a desktop application for note-taking. It gained popularity for its simplicity, robust features, and ease of use, especially among technical users. While it was once widely used, development has slowed, and alternative note-taking applications have emerged with more active development and modern features.

zim(1), cherrytree(1)