UsersInsights - The Users Insights WordPress user plugin helps you manage your user data in one intuitive, beautiful and searchable place.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Talkwalker - Talkwalker Consumer Intelligence Platform: built for speed of insight, ease of use, and data democratization
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Affinio - Affinio is an advanced marketing intelligence platform that leverages the interest graph to understand today’s consumers.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.