Joplin

Joplin is an offline-first note-taking and to-do app for desktop and mobile that stores notes in Markdown, supports rich attachments, full-text search, web clipping, and end-to-end encrypted synchronization across multiple backends including Joplin Cloud, Nextcloud, WebDAV, S3, and local filesystem. It targets individuals and teams who want a privacy-focused, cross-platform notes workflow with optional self-hosting via Joplin Server.