Matchering - Open-source audio mastering app that masters music based on any reference track you provide.
Sketch - Professional digital design for Mac.
Lurssen Mastering Console - Digital audio mastering powered by years of pro-quality mastering experience.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Audio Mastering - Pro quality, fully functional audio mastering application for iPad.
Affinity Designer - Professional creative software, exclusively for Mac.