Memotoo - Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..
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.
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.
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.
Wammu - Wammu is a mobile phone manager using Gammu as its backend.
Clearbit - Clearbit provides Business Intelligence APIs