You've Got Spam - A new tool that lets you spam back the spammer
Castle - The easiest way to protect your users from getting hacked
CallHero - Win the battle against robocalls with call screening
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
RoboKiller - A paid application for iOS and Android users which blocks and pranks spam callers, such as scammers.
No Stress Booking - Travel planning 'adblocker'