Mixxx - The most powerful free DJ software in the world.
Beatport - Beatport is an online music store specializing in electronic dance music and culture.
VirtualDJ - Virtual DJ Software - MP3 and Video mix software for DJs
Spotify - Map shows when two people play same song at same time
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Publiseer - Publishing should be free and easy