Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
KlickAud - Klickaud is a free web-based application to online download SoundCloud track, music, songs in MP3 formats.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Anything2MP3 - Anything2MP3 is a free online SoundCloud and YouTube to MP3 transformation device which permits you to change over and download SoundCloud and YouTube recordings to MP3.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home
Downvids.net - Download Facebook, Youtube Videos