Drumstick is a set of MIDI libraries using C++/Qt5 idioms and style. It includes a C++ wrapper around the ALSA library sequencer interface. A complementary library provides classes for processing SMF (Standard MIDI files: .MID/.KAR), Cakewalk (.WRK), and Overture (.OVE) file formats. A multiplatform realtime MIDI I/O library is also provided with various output backends, including ALSA, OSS, Network and FluidSynth.

abjad-ext-nauert provides classes for dealing with composer and music theorist Paul Nauert's quantization grids or Q-Grids, for short.

The 6581 SID chip is the sound chip used in the Commodore 64 computer. reMID is a MIDI implementation of the 6581 SID chip using the reSID library to provide a virtual SID-based synthesizer, controllable in real-time via MIDI. It includes support for scripted instruments that allow complex sonic control of the chip.

Helm is a cross-platform polyphonic synthesizer available standalone and as an LV2 plugin.

Synthv1 is an old-school subtractive polyphonic synthesizer with four oscillators and stereo effects.

This package provides a library to access iPod contents. It enables iPod support in music players such as Clementine.

GSequencer allows you to play, capture and create music. There is a piano roll, automation and wave form editor. It has machines for playing drum samples, Soundfont2 sound containers and synthesizers. They usually can be connected to a MIDI input source (instrument). It has support for various audio backends like ALSA, Pulseaudio, JACK, OSSv4 and CoreAudio.

This package provides the LV2 plugin "GxVBassPreAmp", a pre-amplifier simulation modelled after the 1984 Vox Venue Bass 100 Pre Amp Section.

The Sherlock plugin bundle contains LV2 plugins for visualizing LV2 atom, MIDI and OSC events. They can be used for monitoring and debugging of event signal flows inside plugin graphs.

Padthv1 is an old-school polyphonic additive synthesizer with stereo effects. Padthv1 is based on the PADsynth algorithm by Paul Nasca, as a special variant of additive synthesis.

Audacious is an audio player descended from XMMS. Drag and drop folders and individual song files, search for artists and albums in your entire music library, or create and edit your own custom playlists. Listen to CD’s or stream music from the Internet. Tweak the sound with the graphical equalizer or experiment with LADSPA effects. Enjoy the modern GTK-themed interface or change things up with Winamp Classic skins. Use the plugins included with Audacious to fetch lyrics for your music, to set an alarm in the morning, and more.

Sfizz provides an SFZ parser and synth C++ library. It includes LV2 plugins and a JACK standalone client.

x42-plugins is a collection of over 80 cross-platform LV2 audio and MIDI plugins that can also run as standalone JACK applications.

The purpose of beets is to get your music collection right once and for all. It catalogs your collection, automatically improving its metadata as it goes using the MusicBrainz database. Then it provides a variety of tools for manipulating and accessing your music.

Libpd provides Pure Data as an embeddable audio synthesis library. Its main purpose is to liberate raw audio rendering from audio and MIDI drivers.

mididings is a MIDI router/processor based on Python, supporting ALSA and JACK MIDI. Features include:

• MIDI routing and filtering; filter events depending on their event type, channel, note number, velocity, etc., and freely route them between an arbitrary number of input and output ports.

• Modifying and converting MIDI events; transpose notes, apply velocity curves, change controller values and ranges, or convert events to any other MIDI event type. mididings also includes more complex functions like a diatonic harmonizer, floating split points, latched notes, and more.

• Seamless switching between patches; set up different "scenes", each with its own MIDI routing and processing, and switch between them at any time, even while playing. Switching scenes does not affect notes already held, and does not result in dropouts or stuck notes!

• MIDI event monitoring, running external commands; print MIDI event data to the console to help debugging your patches and configuring your MIDI controllers. In addition to its MIDI output, mididings can also execute shell commands and send OSC or DBUS messages.

klick is an advanced command-line based metronome for JACK. It allows you to define complex tempo maps for entire songs or performances.

PortMidi is a library supporting real-time input and output of MIDI data using a system-independent interface.

Midicsv reads a standard MIDI file and decodes it into a comma-separated value file (CSV), which preserves all the information in the MIDI file. The ASCII CSV file may be loaded into a spreadsheet or database application, or processed by a program to transform the MIDI data (for example, to key transpose a composition or extract a track from a multi-track sequence). A CSV file in the format created by midicsv may be converted back into a standard MIDI file with the csvmidi program.

Jack-keyboard is a virtual MIDI keyboard, a program that allows you to send JACK MIDI events (i.e. play) using your PC keyboard.

This plugin for beets automatically obtains tag data from https://bandcamp.com/. It's also capable of getting song lyrics and album art using the beets FetchArt plugin.

MediaFile is a simple interface to the metadata tags for many audio file formats. It wraps Mutagen, a high-quality library for low-level tag manipulation, with a high-level, format-independent interface for a common set of tags.

Music player with support for most common audio formats, and plugins for various additional features such as visualization, effects and online service integration. In addition to a Qt-based interface it supports Winamp/XMMS skins.

Clementine is a multiplatform music player. It is inspired by Amarok 1.4, focusing on a fast and easy-to-use interface for searching and playing your music.