Yoshimi is a software audio synthesizer, originally forked from ZynAddSubFX.
LMMS
Let’s make music
with a free, cross-platform tool for your computer.
drumkv1
drumkv1 vetus-schola all-digital drum-kit sampler synthesizer with stereo fx.
Patroneo
An easy to use, pattern based midi sequencer, a program that sends digital “notes” to software instruments such as synthesizers and samplers.
NON
Non est effectus unius hominis desiderium aedificare completum Free-software Digital Audio Workstation in GNU / Linux quod vere operatur-in accessible hardware.
Rosegarden
Rosegarden est a musica compositionem et edere environment secundum a midi sequencer quod features a dives intellegentia musicae notationis et includit basic firmamentum Digital audio.
Musa Score
Create, ludere ac imprimere pulchra sheet music
Luppp
Luppp est a musica creatio instrumentum, animo est vivere usum. Et focus est in ipsa tempus processus et ieiunium et intuitive workflow.
padthv1
padthv1 is an old-school polyphonic additive synthesizer with stereo fx.
Cecilia
Cecilia is an audio signal processing environment aimed at sound designers. Cecilia mangles sound in ways unheard of. Cecilia lets you create your own GUI using a simple syntax. Cecilia comes with many original built-in modules and presets for sound effects and synthesis.