Schism Tracker is a free and open-source reimplementation of Impulse Tracker, a program used to create high quality music without the requirements of specialized, expensive equipment, and with a unique "finger feel" that is difficult to replicate in part. The player is based on a highly modified version of the ModPlug engine, with a number of bugfixes and changes to improve IT playback.
MusE is a MIDI/Audio sequencer with recording and editing capabilities written originally by Werner Schweer now developed and maintained by the MusE development team. MusE aims to be a complete multitrack virtual studio for Linux, it is published under the GNU General Public License.
Radium is a modern music editor with a fresh and responsive interface. It provides a better sequencing overview with a widescreen layout. Positions and effects can be edited graphically. It provides for automation of velocity, effects, pitches and tempo; has smooth scrolling, MIDI sequencing, a modular mixer, LADSAP and VST plugins, zooming, microtonality, and an extension language.
FLTracker is MIDI sequencer for Linux with a FLTK GUI. It runs on ALSA, lists track numbers, output device and MIDI channel, notes, volume, effects and parameters; understands GM patches, drum sounds, and controllers.