EteSync!

DAVdroid is the only all-in-one synchronization solution for both contacts and calendars based on WebDAV (CardDAV and CalDAV). The app is easy to set up and integrates perfectly with your favorite calendar/contacts app (including default apps). It can also be used seperately, if you either have CalDAV or CardDAV.

Synchronize your Android, Pocket PC, or iPhone with Thunderbird and Sunbird

SyncMate syncs data on Mac with Android and iOS devices, Windows services (Outlook, Office 365 Business and Office 365 Home accounts), other Macs, Google, Dropbox and iCloud accounts, any mounted storage devices, MTP devices.