Drupe - Next generation contact manager and dialer.
Phone + Contacts and Calls - Phone + Contacts and Calls app offers features that let you backup and synchronize your phone book so you can view it on all your other smart devices as well as can also restore it for later use.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Simple Contacts - Contact lens prescriptions from home
GNOME Contacts - All your contacts in one place
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.