EteSync

Your Data, Yours Only.

Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars and tasks.

Easy to use and open source - it seamlessly integrates with your existing apps so you won't even notice you are using it! You can either use the hosted service (paid) or run your own server (self-host).

The best way to support EteSync is to become a paying EteSync user on https://www.etesync.com though donations here are more than welcome.