Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
clearout.io - Clearout Email Finder & Email Verification Service - Drive sustainable business growth by expanding your reach, lowering hard bounces, and improving deliverability rates.