Noiseclock is a console-based program designed to summarize the amount of time needed to play a given sound file or directory of files. Output can be any combination of days, hours, minutes, and seconds. It supports any of the sound formats supported by TagLib, which are currently MP3, OGG, and FLAC compressed files.
SlimScrobbler is an slimserver plugin that builds a profile of your musical tastes by sending the name of every song you play to the Audioscrobbler server, which updates your musical profile with the new song. Every person with a plugin has their own page on the site that shows their listening statistics, and the system automatically matches you to people with similar musical tastes, and generates personalized recommendations.
songanalysis analyzes a song in WAV, Ogg Vorbis, or MP3 format and produces an output consisting of the volume differential, the relative strength in each frequency band, and the tempo. This is useful if you want to build something that lets you find out whether you have duplicate files, if you need to find out the tempo of your songs, or if you need to find similar songs according to how they sound.
Lava's jWave is a versatile set of packages for Java that allow you to easily create and process RIFF files, with a special emphasis on reading and writing Microsoft PCM .wav files. jWave was initially released as an integrated feature of Lava, a general-purpose class library for Java. By popular demand, it is distributed in its own bundle.