MuseScore is cross-platform, multi-lingual, open source music notation software. It features an easy to use WYSIWYG editor with audio score playback for results that look and sound beautiful. It supports unlimited staves with up to four voices each, dynamics, articulations, lyrics, chords, lead sheet notation, import/export of MIDI and MusicXML, export to PDF and WAV, plus online score sharing.MuseScore can upload scores directly to the score sharing site musescore.com. Program support is provided on musescore.org.Features supported by MuseScore include:Unlimited score lengthUnlimited number of staves per systemUp to four independent voices per staffScore creation wizard and templatesAutomatic part extraction and transpositionRepeats, including segnos, codas, and measure repeatsDynamics, articulations, and other expression markings, with playback support for mostCustom text markingsLyricsChord symbolsJazz notation, including lead sheets, slash notation and a “handwritten” font for textSwing and shuffle playbackMixer for instrument levels and effectsPercussion notationEarly music notationCross-staff beamingImport of graphicsCustom key signaturesAdditive time signaturesUser-defined score stylesMost elements in MuseScore are laid out automatically but can also be positioned manually. The capabilities of MuseScore can be extended via plugins, and the growing repository on musescore.org contains many plugins submitted by users.MuseScore includes a set of sounds that reproduce common instruments (as defined by General MIDI) without taking up a lot of disk space or memory, but you can also substitute any SoundFont you prefer for a wider variety of sounds or for more realism.MuseScore can import and export MIDI and MusicXML files, and it can also import from Capella and several other programs. MuseScore can export to PDF, PNG, and other graphic formats, to WAV and other audio formats, or to Lilypond for an alternative layout and print option.

MuseScore

Create, play and print beautiful sheet music

Mixxx is free DJ software that gives you everything you need to perform live DJ mixes. Blend songs together with automatic BPM matching and remix on-the-fly with looping and hot cues. Whether you're a pro DJ or just getting started, Mixxx has you covered.Mixxx works with ALSA, JACK, OSS and supports many popular DJ controllers. Key features include:Parallel or split scratchable waveform displaysMP3, OGG, WAVE, FLAC, and optional AAC (M4A) playbackWAVE, OGG, and optional MP3 recordingFast, database-powered libraryCrates and playlists for organizing your musicReads iTunes, Traktor, and Rhythmbox librariesCross-platform - works on Windows, Mac OS X and LinuxShoutcast and Icecast broadcastingSupport for many DJ MIDI and HID controllers out-of-the-boxAdvanced MIDI scripting engine for maximum flexibilityVinyl emulation with Serato, Traktor, and Mixvibes timecode supportBeat and key detectionReplayGain volume normalizationAutomatic crossfading with Auto DJSkinnable interface with several skins bundled

Mixxx DJ Software

Everything you need to perform live DJ mixes

Bitwig Studio is a digital audio workstation (DAW) that inspires you to take greater control of your music, giving you access to every aspect of your production. Streamline your creative process and quickly evolve your ideas into complete songs, tracks, and compositions. Record and arrange, improvise and perform, or do it all at once. Design sounds. Build instruments. &lt;em&gt;Make music.&lt;/em&gt;

Bitwig Studio

Zrythm is a digital audio workstation designed to be featureful and easy to use. It offers streamlined editing workflows with flexible tools, limitless automation capabilities, powerful mixing features, chord assistance and support for various plugin and file formats.Zrythm can be extended with user scripts written in Scheme or ECMAScript.

Zrythm

FamiStudio

Helio is an attempt to rethink a music sequencer to create a tool that feels right. It provides a lightweight UI to help you get into the zone and focus on your ideas.

Helio Workstation

Helio Project libre music composition software

MusE is a MIDI/Audio sequencer with recording and editing capabilities. It can perform audio effects like chorus/flanger in real-time via LASH and it supports Jack and ALSA interfaces. MusE aims to be a complete multitrack virtual studio for Linux.

MusE

Rosegarden is a general-purpose music composition and editing environment that offers a mixture of features inspired by MIDI sequencers, score editors, and DAWs.  Rosegarden offers a variety of extensions that work in conjunction with LilyPond to produce beautiful scores that often require little or no manual editing, and it generally does a good job of rendering human MIDI performances as legible notation.Rosegarden is ideal for the small scale home artist who wishes to use one tool to handle a music project from start to finish.  For example, you can record your musical idea with a MIDI keyboard, write out transposing parts for the members of a brass band, and record the band playing these parts all in the same document in the same application.  Rosegarden supports a variety of import and export formats, and works well in conjunction with other applications.

Rosegarden

MIDI and Audio Sequencer and Notation Editor

Qtractor is an Audio/MIDI multi-track sequencer application written in C++ around the Qt framework using Qt Designer.The initial target platform will be 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.

Qtractor

GSequencer provides you various tools to play, create, edit and mix your own music. It features a step sequencer, piano roll, automation and wave-form editor.

GSequencer

ChibiTracker is a portable IT (Impulse Tracker) clone. It is not a 100% clone though, as it adds more features, such as chorus and reverb, stereo samples, an advanced sample editor and more. The user interface also presents some changes, as it can be custom themed and resized.ChibiTracker is Open Source Software under the GNU Public License, and it can be run under Windows, Mac-OS, Linux, FreeBSD, BeOS, and more to come.For those who haven't used trackers before, ChibiTracker is a small, compact music composing application that is easy to learn and powerful enough to sound good.

ChibiTracker

ChibiTracker is a portable IT (Impulse Tracker) clone

Stochas is a probabilistic polyrhythmic sequencer.