Joplin

Joplin is a free, open-source, and fully-featured note-taking and to-do application which can handle a large number of markdown notes organized into notebooks and tags.

Key Features:

• End-to-end encryption for all notes
• Markdown support with live preview
• Synchronization through Nextcloud, Dropbox, and more
• Easy import from Evernote and plain-text notes
• Web clipper browser extension
• Cross-platform: Windows, macOS, Linux, iOS, Android

Privacy: Your notes are encrypted locally before being synchronized, ensuring only you can read them.