You-Get - Command-line utility to download media contents from the web
iEasyRecorder - iEasyRecorder is a powerful Mac audio recording program which allows you to record audio, sounds and music from any applications.
CONV. - Convert YouTube video to MP3, GIF or MP4
ScreenRec Streaming Video Recorder - ScreenRec is a free streaming recorder with audio that lets you capture hours of live video from any website.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
MP3myMP3 - MP3myMP3 Recorder saves any audio you hear on your computer straight to mp3 or wav.