The fre:ac audio converter project
Automatically pause your music, set individual apps' volumes, etc.
A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 / 11
A high quality MP3 encoder
Multiplatform MIDI File Player for Linux, Windows, and macOS
Audio Tag Editor
Search, Download, Play, Share on Bittorrent and the cloud
Icecast and Shoutcast broadcasting client
Graphical editor software for many Boss and Roland effect & synth unit
An Audio/MIDI multi-track sequencer
Multi-Format Audio-Encoder Front-end
Turn your PC into a very advanced MediaCenter/HTPC
View and edit DICOM tags (Windows & Mac & Linux)
MIDI libraries for Qt/C++
ASIO output module for winamp media player & SRD file resampler
Repeating your Intentions millions of times per second
MIDI monitor for Linux
Quimup is a Linux client for MPD
Spatially Oriented Format for Acoustics
Hybrid Virtual Synthesizer
it's a video player, also works for music and pictures