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.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Cardbox - Contacts reimagined as a social network ✨
Drupe - Next generation contact manager and dialer.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
ContractHero - Intuitively organize contracts and be reminded of deadlines