You've Got Spam - A new tool that lets you spam back the spammer
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.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
Callwarden - Go to war on spam calls 📵