Ex Falso is a cross-platform free and open source audio tag editor and library organizer. It is a user interface sharing the same backend software as Quod Libet, minus the ability to play music. It is written by the same software team responsible for Quod Libet and in the words of the developers, "If you're perfectly happy with your favorite player and just want something that can handle tagging, Ex Falso is for you."Ex Falso uses Mutagen the Python module to handle audio metadata.