GNU MPC is a C library for performing arithmetic on complex numbers. It supports arbitrarily high precision and correctly rounds the results.

LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines.

TomsFastMath is a large integer library written in portable ISO C. It is a port of LibTomMath with optional support for inline assembler multiplies.

Fabla is an LV2 drum sampler plugin instrument. It is ideal for loading up your favorite sampled sounds and bashing away on a MIDI controller.

B.Jumblr is a pattern-controlled audio stream / sample re-sequencer LV2 plugin.

The MusicBrainz Client Library (libmusicbrainz), also known as mb_client, is a development library geared towards developers who wish to add MusicBrainz lookup capabilities to their applications.

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.

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

PaulXStretch is an application/plugin is based on the PaulStretch algorithm (Paul’s Extreme Time Stretch, originally developed by Nasca Octavian Paul), and specifically the PaulXStretch version from Xenakios.

pysmf is a Python extension module for reading and writing Standard MIDI files, based on libsmf.

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

This package provides the LV2 plugin "GxVoodooFuzz", a simulation modelled after the Voodoo Lab SuperFuzz pedal. It's basically a Bosstone circuit, followed by the tone control of the FoxToneMachine in parallel with a DarkBooster, followed by a volume control.

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.

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.

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.

DUMB is a tracker library with support for IT, XM, S3M and MOD files. It targets maximum accuracy to the original formats, with low-pass resonant filters for the IT files, accurate timing and pitching, and three resampling quality settings (aliasing, linear interpolation and cubic interpolation).

abjad-ext-rmakers includes a collection of classes for creating and and manipulating rhythms such as accelerandi, taleas, and more.

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.

This package provides an Emacs major mode for editing GNU LilyPond music scores.

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.

Aj-snapshot is a small program that can be used to make snapshots of the connections made between JACK and/or ALSA clients. Because JACK can provide both audio and MIDI support to programs, aj-snapshot can store both types of connections for JACK. ALSA, on the other hand, only provides routing facilities for MIDI clients. Aj-snapshot is meant to be used from the command line.

New Session Manager (NSM) is a tool to assist music production by grouping standalone programs into sessions. It can be used create a session, or project, and add programs to it and then use commands to save, start/stop, hide/show all programs at once, or individually. The session can be interrupted and easily resumed at a later time.

Mamba is a virtual MIDI keyboard and MIDI file player/recorder for the JACK Audio Connection Kit. It comes with predefined keymaps for QWERTZ, QWERTY and AZERTY keyboards and also allows custom ones.

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