AudioTool - Whether you want to make music for the club, or you're aiming to put a few tracks to a film, Audiotool is a website geared towards putting the mixes at your fingertips. Read more about AudioTool.
Loopy Pro - Loopy, the sophisticated, tactile live looper app that reinvents iPhone and iPad music making.
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
Repetito - Repetito: the multichannel looper software for live performance on the PC.
Ohm Studio - Ohm Studio is the first real-time collaborative digital audio workstation.
Group the Loop - Live Looping with usefull GUI, Verse/Chorus layer system, drummer, effects, etc...