Synchronize contacts, events, tasks with your Android device using DAVdroid! is a German Internet portal which also provides an email service, address books and calendars.

CalDAV setup

CalDAV base URL:
User name and password: your user name and password

CardDAV setup

Choose "Login with email address", and enter your email address and password.

You can also use the base URL and your email address and password.

No CardDAV contact group support. Choose "per-contact categories" as contact group method to minimize problems.