Open Source Sound/Audio Software

MuseScore is a free and open-source music notation software designed for composers, arrangers, educators, and musicians of all levels. It allows users to write, edit, and print professional-quality sheet music with no limitations or subscription fees. MuseScore Studio supports a wide range of instruments and ensembles, from solo piano and guitar to full orchestras and choirs. The software is easy to learn while still offering powerful tools for advanced notation and score layout. With support for MIDI input and formats like MusicXML and MIDI, MuseScore integrates smoothly with other music software and workflows. Built by a global open-source community, MuseScore continues to evolve through active development and community contributions. Support MuseScore at http://musescore.org/en/donate

This seems to be just another PHP Web Client (MPC) for the famous music server project MPD (Music Player Daemon). But it is the continuation of the existing projects phpMp, phpMp+, phpMp2, phpMp3 and thus as stable as them, although new an shiny. Simple and easy to use. Suggestions and help are welcome! Why should I donate or leave any kind of feedback? As most developers know, open source software cannot be measured in amounts of money. Because the time spent to provide the current state of software is uncountable. So any donation or simply feedback is more than welcome and will encourage the team to move on and provide new features. - Thank you!

XBMC Media Center is a free cross-platform media player software and entertainment system application framework for Linux, Mac, and Windows. XBMC is capable of playing back and streaming all popular video, audio, and picture formats out-of-the-box.

A library which provides high performance beat detection for the Mac OS X and iOS platforms, based on Paul Brossier's aubio library. Using Apple's vDSP library for FFT computation and vector operations this library written in c++ prioritizes fast and energy-efficient beat detection.