Keep track of your notes and journalings without giving them to a third-party.
Joplin is a free, open source, fully featured note taking and to-do application, which can handle a large number of markdown notes organized into notebooks and tags. It offers E2EE encryption and can sync through Nextcloud, Dropbox and more. It also offers easy import from Evernote and plain text notes.
Standard Notes is a simple and private notes app that makes your notes easy and available everywhere you are. Features end-to-end encryption on every platform, and a powerful desktop experience with themes and custom editors.
Turtl lets you take notes, bookmark websites, and store documents for sensitive projects. From sharing passwords with your coworkers to tracking research on an article you're writing, Turtl keeps it all safe from everyone but you and those you share with.
- Note: As of Dec 2018, Joplin does not support password/pin protection for the application itself or individual notes/notebooks. Data is still encrypted in transit and at sync location using your master key. See open issue.
- Notable - The markdown-based note-taking app that doesn't suck.
- Paperwork - Open source and self-hosted solution. For PHP / MySQL servers.
- Org-mode - A major mode for GNU Emacs. Org-mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.