Mixxx is Free DJ software that gives you everything you need
An old-school polyphonic synthesizer
Audio visualisation library
The X Jack Video Monitor
A feature packed DJ console and internet radio client for Linux users
Music Player Daemon SACD/DVD-A ISO decoder plugins
Specialized sound synthesizer with Byzantine Church music scales
it's a video player, also works for music and pictures
Polyphonic synthesizer LV2 plugin
Ballroom Music Player
Plays iMelody (IMY) files using many sound systems
Very simple MIDI Player of JSON files
Tool to remotely activate Text-To-Speech (TTS) on a server
"CommBusTerm"
A c++ public domain audio output class
GUI to work with abc notation