Linphone is free and open-source application that provides an internet phone or Voice Over IP phone (VoIP). With Linphone, you can communicate freely with people over the internet, with voice, video, and text instant messaging. It is available for desktop computers: Linux, Windows, MacOSX, and for mobile phones: Android, iPhone, Blackberry.
A utility for transferring data from iPod, iPad or iPhone to MacBook.
Allows you to dial your friends directly from your Mac.
Compact and convenient reminder for Mac OS X.
Professional app that allows you to edit voices.
With Frynga you can make FREE CALLS over the internet.