Record audio content on your Mac and export the results to various formats.
IMCapture for Skype (was SkypeCap) captures and records audio and video calls made from Skype.
Callnote Premium is a Free app for recording Skype, Hangouts, Viber, Facebook, GoToMeeting and WebEx Audio&Video Calls.
Call Recorder for FaceTime allows you to record FaceTime audio and video calls.