Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
PhoneTray - Block an unlimited number of phone calls using USB voice/data/fax/caller-id dial-up modem.
WhosCall - WhosCall is a reliable caller ID app whose popularity has led to its adoption by many users including international media. You can now manage the numbers calling you regardless of whether they are part of your contact list or not... read more.
Call Station - CallStation is computer answering machine, phone dialer, and Caller ID software.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
SmartCallMonitor - SmartCallMonitor automatically matches caller data with existing Outlook contacts and displays them.