Contacts+ - Your free all-in-one contacts manager.

Basically, Contacts Plus is more than just a simple contact manager. The free app lets you pull data from Facebook, Twitter, Whatsapp, LinkedIn, Foursquare and have them all in one place. Your friends who have a presence on any of those networks will have their data in Contacts Plus so you can interact with them in one place. A bit like the People hub for Windows Phone. I'm using Contacts Plus in place of the stock Android contact manager. I recommend this app. It is very efficient in that you won't have to move in and out of several apps to stay in touch with your friends.

Download: Google Play.

Features:
★ Beautiful contacts design
★ Integrated Dialer, Call log and Messages list (swipe left/right)
★ Light / Dark themes
★ Groups & favorites contacts display
★ Grid / List contacts view
★ Smart contacts prioritization by Frequency or sort by A-Z / Recents
★ Send FREE & regular text messages to your contacts from one place
★ View contacts messages history (thread) in their profiles
★ Whatsapp, Facebook, Twitter, Linkedin & Foursquare integrated in your contacts
★ Navigate to your contacts addresses from their profiles
★ Auto pictures and birthdays sync with Facebook, including cover photos
★ Auto pictures sync with Google+
★ Merge duplicate contacts (supports most devices)
★ Contacts widget
★ Birthdays reminders
★ Fast T9 & Gesture search by names, numbers, emails and company
★ Quick call - press & hold a contact pic to call from your main contacts screen
★ Speed dial!