HyperDroid-DAV
Fork of DroidDAV - CalDAV/CardDAV Synchronization for android
Fork of DAVdroid is the all-in-one synchronization solution for your contacts (CardDAV), calendars (CalDAV) and your tasks (based on VTODO). The app is easy to set up and integrates with your any calendar/contacts app (including default apps). It can also be used seperately, if you either have CalDAV, CardDAV or only Tasks.