Joplin includes all the basic features, and on top of that it's open source software, it includes encryption support, and you also get to choose the service you want to use for synchronization. While it doesn't offer as many features as Evernote, Joplin is a robust open source Evernote alternative. Related: EncryptPad: Encrypted Text Editor For Your Secrets Joplin with hidden sidebar showing checkboxes and a link to another note

Offline first, so the entire data is always available on the device even without an internet connection.Export JEX files (Joplin Export format), PDF and raw files.Import Enex files (Evernote export format) and Markdown files.Optional Web Clipper extension for Firefox and Chrome (in the Joplin desktop application go to Tools > Web clipper options to enable the clipper service and find download links for the Chrome / Firefox extension) which can clip simplified or complete pages, clip a selection or screenshot.To-do items in Joplin support alarms, but this feature didn't work for me on Ubuntu 18.04. Each notebook can contain notes, to-do items, or both, and you can easily add links to other notes (in the desktop app right click on a note and select Copy Markdown link, then paste the link in a note). You can also sort notes by updated date, creation date or title. The application should handle a large number of notes pretty well by allowing you to organizing notes into notebooks, add tags, and search in notes. You can add attachments to your notes (with image previews) or edit them in an external Markdown editor and have them automatically updated in Joplin each time you save the file. With Joplin you can write your notes in the Markdown format (with support for math notations and checkboxes) and the desktop app comes with 3 views: Markdown code, Markdown preview, or both side by side.

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