No specific info about version 5.1. Please visit the main page of Contacts Sync For Google Gmail on Mac Informer.
Is the easiest way to find your Address Book contacts using Google Maps
Application to share and sync the contacts and Address Book groups.
This application can easily transfer Android contacts to iPhone directly on Mac.
It helps you backup, restore and manage Android Contacts information on Mac.
This application allows you to backup, transfer and manage your iPhone contacts.