PhoneCopy - Transfer your contacts and other data between your phone and an online storage. Keep your data in sync, backed up, and accessible anywhere with PhoneCopy.
fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Wammu - Wammu is a mobile phone manager using Gammu as its backend.
FullContact - Put the power of full contact information into your web or mobile apps.
OxyFile - Oxygen Forensics - Mobile forensic software for cell phones, smartphones and other mobile devices
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.