Castle - The easiest way to protect your users from getting hacked
You've Got Spam - A new tool that lets you spam back the spammer
Mail Dump - Powerful Extensions for email addresses extracting, verifying and finding
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
RoboStopper - Block spam calls or get paid for them wasting your time
Antideo - Email, IP address and phone number validation API service