QMidiArp is an advanced MIDI arpeggiator, programmable step sequencer and LFO. It can hold any number of arpeggiator, sequencer, or LFO modules running in parallel.

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.

Glyr comes both in a command-line interface tool (glyrc) and as a C library (libglyr).

The sort of metadata glyr is searching (and downloading) is usually the data you see in your musicplayer. And indeed, originally it was written to serve as internally library for a musicplayer, but has been extended to work as a standalone program which is able to download cover art, lyrics, photos, biographies, reviews and more.

ZPlugins is a collection of audio DSP plugins intended to be bundled with the Zrythm digital audio workstation (DAW).

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

Qtractor is an Audio/MIDI multi-track sequencer application. It uses JACK for audio and ALSA sequencer for MIDI as multimedia infrastructures and follows a traditional multi-track tape recorder control paradigm.

LMMS is a digital audio workstation. It includes tools for sequencing melodies and beats and for mixing and arranging songs. LMMS includes instruments based on audio samples and various soft sythesizers. It can receive input from a MIDI keyboard.

Music21 is a set of tools for helping scholars and other active listeners answer questions about music quickly and simply.

Aria Maestosa is a MIDI sequencer and 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.

The main goal of liquidsfz is to provide an SFZ sampler implementation library that is easy to integrate into other projects. A standalone JACK client and an LV2 plugin is also available.

This package provides the LV2 plugin "GxPushPull", a simulation of a push pull transistor fuzz effect with added high octave.

The VL1-Emulator is an emulator of Casio VL-Tone VL1, based on source code by PolyValens, offered as an LV2 plugin and a standalone JACK application.

SooperLooper is a live looping sampler capable of immediate loop recording, overdubbing, multiplying, reversing and more. It allows for multiple simultaneous multi-channel loops limited only by your computer's available memory.

ArtyFX is an LV2 plugin bundle of artistic real-time audio effects. It contains a bitcrusher, delay, distortion, equalizer, compressor, and reverb.

This module searches the MusicBrainz database through their web service at musicbrainz.org.

amsynth is an easy-to-use software synthesizer with a classic subtractive synthesizer topology. Its features include: dual oscillators (sine, saw, square, noise) with hard sync; 12 and 24 dB/oct resonant filters (low-pass, high-pass, band-pass, notch); mono, poly, legato keyboard modes; dual ADSR envelope generators for filter and amplitude; LFO which can modulate the oscillators, filter, and amplitude; distortion and reverb effects.

Mopidy is an extensible music server written in Python. It plays music from local disk or cloud services, and can be controlled using a variety of MPD and web clients.

Le Biniou is a music visualization & VJing tool. It creates live visuals based on audio performances or existing tracks.

The Non Sequencer is a powerful, lightweight, real-time, pattern-based MIDI sequencer. It utilizes the JACK Audio Connection Kit for MIDI I/O and the NTK GUI toolkit for its user interface. Everything in Non Sequencer happens on-line, in real-time. Music can be composed live, while the transport is rolling.

Power Tab Editor 2.0 is the successor to the famous original Power Tab Editor. It is compatible with Power Tab Editor 1.7 and Guitar Pro.

This is a Faust implementation of a 1969 designed Yamaha combo organ, the YC-20. This package provides an LV2 plugin and a standalone version. Processing for the organ is based on original schematics and measurements from a working specimen. This instrument simulates the circutry as a whole to realisticly reproduce the features and flaws of the real deal.

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

Zrythm is a digital audio workstation designed to be featureful and easy to use. It offers unlimited automation options, LV2 plugin support, JACK support and chord assistance.

GNU LilyPond is a music typesetter, which produces high-quality sheet music. Music is input in a text file containing control sequences which are interpreted by LilyPond to produce the final document. It is extendable with Guile.