Audio Hijack Pro

Audio Hijack Pro screenshots

Helps you record your favorite radio broadcasts or audio conferences with ease.
Audio Hijack Pro : Settings Window

Alternative downloads

Apowersoft Audio Recorder for Mac
Record audio content on your Mac and export the results to various formats.
Record Studio Pro
Record your screen or microphone audio.
Ondesoft Audio Recorder for Mac
It lets you record audio content from any app within your Mac.