Catalog

Notepad++ is a free, open-source source code editor for Windows, a Notepad replacement with syntax highlighting for many programming and natural languages.

Joplin is a free, open-source note-taking app for Windows, macOS, Linux, Android and iOS that keeps notes in Markdown and syncs them with end-to-end encryption.

calibre is a free, cross-platform desktop ebook manager that views, converts, edits and catalogs e-books and syncs them with e-reader devices.