Maximus - Image-Line's advanced compressor, limiter and maximizer plugin.
Matchering - Open-source audio mastering app that masters music based on any reference track you provide.
Complexer - Cross-platform, multi-stage dynamics processor.
Lurssen Mastering Console - Digital audio mastering powered by years of pro-quality mastering experience.
Fabfilter Pro C - High-quality compressor plug-in for the most demanding engineers
Audio Mastering - Pro quality, fully functional audio mastering application for iPad.