Extract MP3 music from YouTube videos
You like to listen to music on YouTube website but want to do it offline or on your favorite portable player. You have found soundtrack of new movie on YouTube and want to save it to your music library as MP3. Then MediaHuman YouTube to MP3 Converter is a best choice for you. This impressive software is extremely simple to use and allows you to extract audio track from your favorite videos and music clips. There is no limitations in the free version, although if you buy TurboBoost option it will increase download speed dramatically. More Info »
On GNU/Linux system. Can't go wrong with this. It works. its fast.
You windows I've used Free YouTube Download which was pretty good - MediaHumas' YouTube To MP3 seems like the best alternative for mac.