LiveTrax - LiveTrax is an app by MasterMedia Productions through which musicians can control the playback of their favorite track during live performances by using simple controls.
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
TrueFire - The Best Guitar Lessons Online Fast. Easy. Fun.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home
Go Button - Go Button is a mobile audio app designed to provide professional playback of music and sound effects for live shows. It provides a creative, self-contained show control system that runs on your iPad, iPhone, or iPod touch.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!