Google Sync is described as 'service from Google that provides over-the-air synchronization of Gmail, Google Contacts, and Google Calendar with PC and mobile device Mail, Calendar and Address Book applications' and is a popular app in the Office & Productivity category. There are more than 25 alternatives to Google Sync for a variety of platforms, including Windows, Mac, Android, iPhone and Online / Web-based. The best alternative is ownCloud, which is both free and Open Source. Other great apps like Google Sync are fruux (Freemium), Kontact - KAddressBook (Free, Open Source), PhoneCopy (Freemium) and Contacts (Paid).
It supports large variety of services, including NextCloud, Kolab, Google Contacts, Microsoft Exchange (EWS) or any standard CalDAV server. Features: Powerful search - KAddressBook has configurable filters and powerful search capabilities.
PhoneCopy is the easiest way to backup, manage, and synchronize personal data from a mobile phone to the cloud. Phonecopy securely manages phonebook contacts, calendar events, SMS messages, photos, and videos. All data are accessible via a web browser.
Contacts is a flexible and convenient place to store information for everyone you know. It’s easy to import names, numbers, addresses, and photos from Facebook, LinkedIn, Google, and even Microsoft Exchange.
With Memotoo, sync all you want ! Sync and share your personal datas (bookmarks, address book, calendar, files, ...) with Memotoo.com to find them from any computer connected to Internet. - Dont lose your data: if you lose or change your mobile phone, ...
GO Contact Sync Mod is an open source tool to synchronize your Microsoft Outlook contacts with Google Mail. With this tool you do not need to enter your contact details more than once, always have the latest version everywhere: in Outlook and in Google.