Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
AkrutoSync - Sync your Outlook contacts, calendar, tasks and notes on your PC direct with your phone via Wi-Fi or a cellular network.Buy · FAQ · Contact Us · SupportPeople also askWhat is Akrutosync?
Google Calendar - Spend less time managing your day & more time enjoying it
DAVx5 - DAVx5 is a CalDAV/CardDAV management and sync app for Android.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
EteSync - Secure, end-to-end encrypted and journaled personal information synchronization.