Computer Musicians\' World is a music creator, modeller and manipulator program. With texture analysis you can represent the structure of music. A score editor, wave editor and a tracker also included as other types of music models.
A Java light software for create and filter wav files. Its a simple and wysiwyg interface, we just drag and drop the module needed for the filter (VCO, VCF, ...) and we can connect those module with pretty cables and listen the result in real-time.
Music::Tag provides a framework to correct music metadata using MusicBrainz and Amazon.
It helps to tune piano, guitar or other instrument.