Mixxx - The most powerful free DJ software in the world.
Giada - Giada is a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians.
VirtualDJ - Virtual DJ Software - MP3 and Video mix software for DJs
Loopy Pro - Loopy, the sophisticated, tactile live looper app that reinvents iPhone and iPad music making.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Group the Loop - Live Looping with usefull GUI, Verse/Chorus layer system, drummer, effects, etc...