Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Clearbit - Clearbit provides Business Intelligence APIs
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Memotoo - Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.