Mixxx is Free DJ software that gives you everything you need
An old-school polyphonic synthesizer
Turn your PC into a very advanced MediaCenter/HTPC
Audio visualisation library
Automatic volume control for all individual apps in real time
The X Jack Video Monitor
Specialized sound synthesizer with Byzantine Church music scales
Ballroom Music Player
A feature packed DJ console and internet radio client for Linux users
Trains quickly score reading and piano playing (MIDI-keyboard)
Hybrid Virtual Synthesizer
it's a video player, also works for music and pictures
Polyphonic synthesizer LV2 plugin
A music tracker software for Windows.
Music Player Daemon SACD/DVD-A ISO decoder plugins
Plays iMelody (IMY) files using many sound systems