Google Contacts!

FullContact's apps let you keep all your contacts in one place, automatically up-to-date. This social contact management software automatically cleans your contacts, enriches them with social profile data, and continually syncs them across devices with all your contact sources. You can also merge duplicate contacts, scan business cards, capture email signatures, and more.

fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!

With Memotoo, sync all you want !

Kylook synchronizes your address book with Outlook, Gmail, Yahoo, Linkedin, iPhone/iPad, Android, Windows mobile, Blackberry. It removes duplicates, allows fine grained access rights, does automatic backup and a lot more. Free up to 600 contacts.

With Free Address Book - Free Phone Book you can note the addresses, phone numbers, mobile, fax, company name, country, city, website address and email addresses of your contacts and partners.

ID Book is a handy, easy to use application specially designed to offer users a simple address book.

Syncs contact between various third-party services and helps to clean them up and merge data.

E-Z Contact Book is a free easy to use yet powerful Windows program to store and manage contact information. You can use it as a business directory, customer database, or a personal contact address/phone book.

es-Builder is a flexible, customizable, friendly, powerful and unique database manager for private personal use.

Business cards are great. Not only do they carry important data, they also project a look and feel through their design, paper type, color, thickness, texture, etc.

Address book program providing unified, flexible and simple interfaces for you to manage and lookup contact info of people and organizations.

KAddressBook stores all the personal details of your family, friends and other contacts.