Flock
A secure contact and calendar syncing application for Android.
Flock is a replacement for the default contact and calendar synchronization services provided by Google. Flock provides end-to-end encryption between multiple Android devices putting the privacy of your contacts and calendars back under your control. To facilitate syncing between multiple devices a “sync service” is required, this can be any standards compliant WebDAV server.
source: https://github.com/WhisperSystems/Flock
site: https://whispersystems.org/blog/flock/
licence: GPLv3
