DAVx⁵ (DAVdroid) – CalDAV/CardDAV Synchronization

DAVx⁵ (DAVdroid) – CalDAV/CardDAV Synchronization - convenient, functional and simple application which will allow you to sync not only contacts and calendar but the programs themselves are responsible for calendars, task scheduling and much more. It is worth noting that the project works without a network connection, and most online services and resources. Sync with other third-party applications in the same difficulty did not cause.