Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
ActiveWords - Auto correct on steroids
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
Zeplin - Collaboration app for UI designers & frontend developers