Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Pushbullet - Pushbullet - Your devices working better together
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
MyPhoneExplorer - WHAT IS MY PHONE EXPLORER? Imagine if your PC could be used to keep track of your mobile phone? How would you utilize a PC client that connects to your phone? Read more about MyPhoneExplorer.