Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
GoSquared Live Chat - Beautiful, simple, and free live chat for your website
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.