TuxGuitar is a free and open-source tablature editor

Virtual MIDI Piano Keyboard: a MIDI events generator and receiver

An Audio/MIDI multi-track sequencer

A fluidsynth Qt GUI Interface

MIDI Sequencer and Notation Editor with Audio Support

Digital Audio Workstation for prototyping

A modular DAW for Linux

Your hardcore loop machine

Learn piano songs with easy notes

Drumstick MIDI Monitor for Linux using ALSA sequencer

SysEx Controls for Linux

Drumstick MIDI Metronome based on the ALSA Sequencer

Sample and MIDI device manager