"6. Amuc (The Amsterdam Music Composer)
Amuc is an application for composing and playing music. You enter
tune fragments graphically, or import from MIDI files. The program
includes 5 different built-in instruments, 6 mono synthesizers, and
sampled instruments.
"7. LMMS (Linux Multimedia Studio)
Similar to FL Studio, LMMS allows you to produce music with your
computer. Features include "the creation of melodies and beats, the
synthesis and mixing of sounds, and arranging of samples. You can
have fun with your MIDI-keyboard and much more; all in a
user-friendly and modern interface."
"11. Qtractor
Qtractor is an Audio/MIDI multi-track sequencer application aiming
evolve as a fairly-featured Linux desktop audio workstation GUI,
specially dedicated to the personal home-studio."