Giada - Giada is a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians.
Loopy Pro - Loopy, the sophisticated, tactile live looper app that reinvents iPhone and iPad music making.
JAM - Shake your sound - Music motion app. Make music by shaking your phone. 🎶
Repetito - Repetito: the multichannel looper software for live performance on the PC.
Blocs Wave - A free audio app for creating music loops.
Group the Loop - Live Looping with usefull GUI, Verse/Chorus layer system, drummer, effects, etc...