DejaGnu - DejaGnu is a framework for testing other programs.
Numlooker - Numlooker is a web-based tool that is used to reverse the phone number that you have received.
Expect - Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin...
Rap Sheet Reverse Caller ID - Rap Sheet Reverse Caller ID is an application that provides you the option to search the information about unknown numbers.
Check - Check is a unit testing framework for C, which runs on environments such as GNU/Linux, GNU/Hurd, BSD, and Mac OSX.
NumLookup - NumLookup is a web-based platform that helps you to get information about a person by providing a phone number.