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.
fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Google Calendar - Spend less time managing your day & more time enjoying it
Nokia Suite - Nokia Suite is the next generation computer software that will replace Nokia PC Suite.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Memotoo - Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..