Strawberry Music Player
An open source and free music notation software
Mixxx is Free DJ software that gives you everything you need
The fre:ac audio converter project
A free multi-track audio editor and recorder
Audio Tag Editor
Icecast and Shoutcast broadcasting client
An Audio/MIDI multi-track sequencer
Free media player with support for Youtube
Multiplatform GUI of MP3Gain which adjusts volume of MP3 files
Multiplatform MIDI File Player for Linux, Windows, and macOS
ASIO output module for winamp media player & SRD file resampler
winLAME is an easy to use encoder for many audio formats, e.g. MP3.
View and edit DICOM tags (Windows & Mac & Linux)
Repeating your Intentions millions of times per second
MIDI libraries for Qt/C++
Automatic audio RMS normalizer & splitter
Quimup is a Linux client for MPD
Music software and a totally non commercial music archive.
Qt XG Editor
Convert PSID and RSID files into C64 executables