Yoshimi is a fork of ZynAddSubFX, a feature-heavy real-time software synthesizer. It offers three synthesizer engines, multitimbral and polyphonic synths, microtonal capabilities, custom envelopes, effects, etc. Yoshimi improves on support for JACK features, such as JACK MIDI.

Mutagen is a Python module to handle audio metadata. It supports ASF, FLAC, M4A, Monkey’s Audio, MP3, Musepack, Ogg FLAC, Ogg Speex, Ogg Theora, Ogg Vorbis, True Audio, WavPack and OptimFROG audio files. All versions of ID3v2 are supported, and all standard ID3v2.4 frames are parsed. It can read Xing headers to accurately calculate the bitrate and length of MP3s. ID3 and APEv2 tags can be edited regardless of audio format. It can also manipulate Ogg streams on an individual packet/page level.

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.

isrcsubmit is a tool to extract International Standard Recording Code (ISRCs) from audio CDs and submit them to MusicBrainz.

Abjad helps composers build up complex pieces of music notation in iterative and incremental ways. Use Abjad to create a symbolic representation of all the notes, rests, chords, tuplets, beams and slurs in any score. Because Abjad extends the Python programming language, you can use Abjad to make systematic changes to music as you work. Because Abjad wraps the LilyPond music notation package, you can use Abjad to control the typographic detail of symbols on the page.

Frescobaldi is a LilyPond sheet music text editor with syntax highlighting and automatic completion. Among other things, it can render scores next to the source, can capture input from MIDI or read MusicXML and ABC files, has a MIDI player for proof-listening, and includes a documentation browser.

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.

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

Abjad helps composers build up complex pieces of music notation in iterative and incremental ways. Use Abjad to create a symbolic representation of all the notes, rests, chords, tuplets, beams and slurs in any score. Because Abjad extends the Python programming language, you can use Abjad to make systematic changes to music as you work. Because Abjad wraps the LilyPond music notation package, you can use Abjad to control the typographic detail of symbols on the page.

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.

This is the continuation of the official Discogs API client for Python. It enables you to query the Discogs database for information on artists, releases, labels, users, Marketplace listings,and more. It also supports OAuth 1.0a authorization, which allows you to change user data such as profile information, collections and wantlists,inventory, and orders.

This is a program for recording sound files with JACK. It can connect to any JACK port and record the output into a stereo WAV file.

Seq24 is a real-time MIDI sequencer. It was created to provide a very simple interface for editing and playing MIDI loops.

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

This is a mixer application to control the Tascam US-16x08 audio interface. This device contains about 280 control elements and this mixer application aims to provide comfortable access to the DSP effects the device supports.

This package provides a multi-channel MIDI step sequencer LV2 plugin with a selectable pattern matrix size.

MusicBrainz Picard is a music tagging application, supporting multiple formats, looking up tracks through metadata and audio fingerprints.

MilkyTracker is a music application for creating .MOD and .XM module files. It attempts to recreate the module replay and user experience of the popular DOS program Fasttracker II, with special playback modes available for improved Amiga ProTracker 2/3 compatibility.

LibSMF is a C library for handling SMF ("*.mid") files. It transparently handles conversions between time and pulses, tempo map handling and more. Full API documentation and examples are included.

The Non Timeline is a powerful, reliable and fast modular digital audio timeline arranger. It utilizes JACK for inter-application audio I/O and the NTK GUI toolkit for a fast and lightweight user interface. Non Timeline can be used alone or in concert with Non Mixer and Non Sequencer to form a complete studio.

InstantMusic downloads a song from YouTube in MP3 format. Songs can be searched by artist, name or even by a part of the song text.

This application displays an icon in the system tray (also known as notification area) of your desktop, which shows the status of the JACK audio server and when you click on it, a menu pops up, which lets you quickly select from the JACK configuration presets you created with QjackCtl. When you select a preset, its JACK engine and driver configuration settings are loaded via DBus into JACK and then the server is restarted. This allows you to switch between different audio setups with just two mouse clicks.

This project is a real time General MIDI synthesizer based on the Sonivox EAS Synthesizer by Google. It does not need external soundfonts, using embedded samples instead.

LSP (Linux Studio Plugins) is a collection of audio plugins available as LADSPA/LV2 plugins and as standalone JACK applications.