Kylook!

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.

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.

With Memotoo, sync all you want !

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

Pobuca - where teams share contacts

Zoho ContactManager helps you manage contacts, deals & tasks all from one place.