ThisNumber is an international directory of phone books and U.S. phone number lookup service.
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Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
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.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.