Open Source ChromeOS MIDI Software

Psycle is a Music tracker (like FastTracker 2 or Impulse Tracker) combined with plugin modularity. It supports its own plugin API, the VST2 plugin standard, and a tracker style sampler playback.

VMPK is a virtual MIDI piano keyboard for Linux, Windows and OSX. Based on Qt and Drumstick the program is a MIDI event generator using the computer's alphanumeric keyboard and the mouse. It may be used also to display received MIDI notes.

A multi-platform software synthesiser emulating (somewhat inaccurately) pre-GM MIDI devices such as the Roland MT-32, CM-32L, CM-64 and LAPC-I. In no way endorsed by or affiliated with Roland Corp. Source hosted at: http://www.github.com/munt/

Aria Maestosa is a midi sequencer/editor. It lets you compose, edit and play midi files with a few clicks in a user-friendly interface offering score, keyboard, guitar, drum and controller views. Git repository: https://github.com/ariamaestosa/ariamaestosa

Impro-Visor® is a music notation tool for producing monophonic lead sheets, specifically intended to help the improviser. Chord symbols are used to generate backing tracks automatically. Improvisation advice exists in the form of note coloration, database of licks, and automatic lick generation from grammars. Grammars can be learned automatically from transcriptions. Styles can be edited and created by the user. Other features include generation of roadmaps for understanding keys and idiomatic chord progressions, chord voicing keyboard, MIDI and MusicXML export. See http://www.cs.hmc.edu/~keller/jazz/improvisor for general information, including tutorials. Support and additional resources are through the user group https://groups.yahoo.com/neo/groups/impro-visor/info. The most recent source code, since summer of 2015, is housed here: https://github.com/Impro-Visor/Impro-Visor This started when SourceForge was down for over one week during an active development period.

MidiQuickFix allows you to directly edit the events in a Midi file. It is intended to make it easy to find and fix problems, such as setting volume and pan values for a track, without the need for a complex Midi sequencing program.

Jalmus is a free, open source music education software helping the musicians, especially pianists, to improve their sight-reading. You can train to read music with both exercises on notes or rhythms.

Speedy MIDI is an editor designed for choirs and singers to quickly generate MIDI files for rehearsal.

A featureful SID-music creation tool (tracker) for the Commodore 64. It includes many advanced effects and tools like keyboard-tracking, tempo-programs/funktempo, gateoff-table-pointers, filter-shift, SID-export, executable-export, MIDI/XM conversion and MIDI-input hardware, etc., etc. NOTE: I left SourceForge for reasons not ethical to mention here. You can find me and my further work at these locations: http://hermit.sidrip.com http://csdb.dk/scener/?id=18806 https://github.com/hermitsoft/

Common Music (CM) is a real-time music composition system implemented in JUCE/C++ and Scheme. It generates musical output via MIDI, OSC, CLM, FOMUS and CSOUND. Its user application is called GRACE (Graphical Real-time Algorithmic Composition Environment)

Frinika is a free, complete music workstation software for Linux, Windows, Mac OSX and other operating systems running Java. It features sequencer, soft-synths, realtime effects and audio recording.

PortMedia was created to develop and share cross-platform, open-source I/O libraries for digital media including MIDI, video, and audio. Only a few things were released under the PortMedia umbrella. These are now hosted by the github.com/Portmidi/ project, where you can find the lastest versions of PortMidi, portsmf (Standard MIDI File support and more), and see github.com/rbdannenberg/scorealign for MIDI and/or Audio score alignment.

SoundHelix is a free versatile Java framework for algorithmic random music composition. SoundHelix can generate random songs, play them (for example, on any number of MIDI devices or MIDI-capable software synthesizers) and is highly customizable using XML configuration. SoundHelix also allows writing the generated music as MIDI files. SoundHelix produces music that is actually enjoyable to listen to.

Drumstick is a tool to play music. This is a set of C++ MIDI libraries using Qt5 objects, idioms and style. It contains a C++ wrapper around the ALSA library sequencer interface; ALSA sequencer provides software support for MIDI technology on Linux. A complementary library provides classes for SMF (Standard MIDI files: .MID/.KAR), and Cakewalk (.WRK) file formats processing. A multiplatform realtime MIDI I/O library is also provided.

DGuitar is a Guitar Pro (*.GP4,*.GP3,GTP) viewer and player that works under Linux, MacOs, Solaris, BSD, Windows, or any other operating system with Java Runtime 1.4.X. http://DGuitar.sourceforge.net If you are a JAVA developer visit this page https://bitbucket.org/mauriciograciag/dguitar/overview

libTiMidity is a MIDI to WAVE converter library that uses Gravis Ultrasound-compatible patch files to generate digital audio data from General MIDI files. This library based on the TiMidity decoder from SDL_sound library.

MIDI Rules is a Rule-Based MIDI Processing Environment that can process (translate, map, convert, filter, trigger, route) MIDI messages. It supports multiple MIDI inputs/outputs, variables (enables state-based processing) and timed/delayed messages.

Give the chord progression and a style and JChordBox generates a song. JChordBox is a library tool that can generate backing tracks from a chord progression and a music style. A music Style is describe using an XML and a MIDI file. You can generate an XML Style file from a MIDI file by adding markers to delimit grooves. An XML Song file describes a chord progression and sets the music style to use. JChordBox comes with several command line tools (GenerateSong, CreateStyleFromMidiFile, SongPlayer …). NEW:The application center is called SongPlayer and is a text based user interface that can play JChordBox song. SongPlayer is a MIDI Player that can loop a song, mute or soloing tracks and displays transport informations. SongPlayer is now the default jar application. NEW:Examples have been added to the distribution package.

WildMidi is a midi processing library and a midi player using the gus patch set.

ABC is a text-based music notation language. This project aims to promote the ABC music notation language by providing cross-platform, open-source tools for manipulating, displaying and playing (via MIDI) ABC files. This project is here for historic reasons and there is not too much activity now. The abcmidi project is updated more frequently.

BeatBox is a Java application in which users use a 16x16 grid of checkboxes to create a beat with various percussion instruments. Beats can be saved and loaded easily. The entire application is as intuitive and user-friendly as possible.

Java/Swing user interface for interacting with the Boss GT8 guitar effects processor using MIDI

This script provides a graphical user interface for accessing the raw text of files created by the free version of Mario Paint Composer. It makes it easier to upload and download songs, and also allows songs to be exported in standard midi format.

Free Clef is a lightweight notation editor which allows you to quickly write your songs and export them to MusicXML format. It lets you distribute interactive sheet music online, and to use score files with a wide variety of music software.

MIDITOR is a command line compiler that takes ASCII edited music which can be in the style of drum or guitar tablature but with accuracy. MIDITOR is comparable to a sequencer. It turns any ASCII editor into a MIDI editor, for loops, sequencing and composing. Any MIDI message can be sent at specific times including patch changes, control changes.... Tracks and channels can be easily rendered in parallel and the powerful macro preprocessor handles the repetitious nature of music writing. Music is easily scored in any editor chromatically and then output as a MIDI file to quickly check and play the score on FluidSynth or Timidity for instance. Conventional style guitar and drum tab can be used, even conventional style notation using macros, or just one line of chromatic notation.