Qtractor is described as 'Audio/MIDI multi-track sequencer application written in C++ with the Qt framework. Target platform is GNU/Linux, where the Jack Audio Connection Kit (JACK) for audio, and the Advanced Linux Sound Architecture (ALSA) for MIDI, are the main infrastructures for' and is a popular music production app in the audio & music category. There are more than 50 alternatives to Qtractor for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best Qtractor alternative is LMMS, which is both free and Open Source. Other great apps like Qtractor are FL Studio, REAPER, Ardour and Ableton Live.