Qsynth is a fluidsynth GUI front-end application written in C++ around the Qt framework using Qt Designer.

Eventually it may evolve into a softsynth management application allowing the user to control and manage a variety of command line softsynth but for the moment it wraps the excellent FluidSynth. FluidSynth is a command line software synthesiser based on the Soundfont specification.

Licence: GNU General Public License (GPL)

Sourceforge project page: http://sourceforge.net/projects/qsynth

Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework. Target platform is Linux, where the Jack Audio Connection Kit (JACK) for audio and the Advanced Linux Sound Architecture (ALSA) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio.

QXGEdit is a Qt GUI for editing MIDI System Exclusive files for XG devices (eg. Yamaha DB50XG).

samplv1 is an old-school all-digital polyphonic sampler synthesizer with stereo fx.

Features:

- a pure stand-alone JACK client with JACK-session, NSM (Non Session management) and both JACK MIDI and ALSA MIDI input support;

- a LV2 instrument plug-in.

URI: http://samplv1.sourceforge.net/lv2

License: GNU General Public License (GPL)

Sourceforge project page: http://sourceforge.net/projects/samplv1

4-oscillator subtractive polyphonic synthesizer