Qtractor - Qtractor is an Audio/MIDI multi-track sequencer application.

Matchering - Open-source audio mastering app that masters music based on any reference track you provide.

Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.

eMastered - eMastered makes a song sound better through online mastering.

Cubase - Cubase is one of the world’s most powerful music creation software packages. From first idea to finished recording, Cubase helps you to make outstanding music.

Audio Mastering - Pro quality, fully functional audio mastering application for iPad.