Keep track of your notes and journalings without giving them to a third party.
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. It offers end-to-end encryption and can sync through Nextcloud, Dropbox, and more. It also offers easy import from Evernote and plain-text notes.
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.