Also Flock by Open Whisper Systems, which did end-to-end encrypted WebDAV sync for Android's Contacts and Calendars. (now discontinued) 1. https://github.com/W

Also Flock by Open Whisper Systems, which did end-to-end encrypted WebDAV sync for Android's Contacts and Calendars. (now discontinued) 1. https://github.com/WhisperSystems/Flock https://github.com/WhisperSystems/Flock 2. https://signal.org/blog/flock/ https://signal.org/blog/flock/