CLN is a C++ library for efficient computations with all kinds of numbers in arbitrary precision. It provides a rich set of number classes and elementary, logical and transcendental functions.

The GMP library performs arbitrary-precision arithmetic on signed integers, rational numbers and floating point numbers. The precision is only limited by the available memory. The library is highly optimized, with a design focus on execution speed. It is aimed at use in, for example, cryptography and computational algebra.

The GMP library performs arbitrary-precision arithmetic on signed integers, rational numbers and floating point numbers. The precision is only limited by the available memory. The library is highly optimized, with a design focus on execution speed. It is aimed at use in, for example, cryptography and computational algebra.

LibTomMath is a portable number theoretic multiple-precision integer library written entirely in C. It's designed to provide an API that is simple to work with that provides fairly efficient routines that build out of the box without configuration.

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

MPFI is a portable C library for arbitrary-precision interval arithmetic, with intervals represented using MPFR reliable floating-point numbers. It's based on the GMP and GNU MPFR libraries.

The purpose of arbitrary-precision interval arithmetic is to get results that are both guaranteed, thanks to interval computation, and accurate, thanks to multiple-precision arithmetic.

This package supports both a double-double datatype (approx. 32 decimal digits) and a quad-double datatype (approx. 64 decimal digits). The computational library is written in C++. Both C++ and Fortran-90 high-level language interfaces are provided to permit one to convert an existing C++ or Fortran-90 program to use the library with only minor changes to the source code. In most cases only a few type statements and (for Fortran-90 programs) read/write statements need to be changed. PSLQ and numerical quadrature programs are included.

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

GNU MPFR is a C library for performing multiple-precision, floating-point computations with correct rounding.

WhySynth is a versatile softsynth which operates as a plugin for the DSSI Soft Synth Interface. A brief list of features:

1. 4 oscillators, 2 filters, 3 LFOs, and 5 envelope generators per voice.

2. 11 oscillator modes: minBLEP, wavecycle, chorused wavecycle, asynchronous granular, three FM modes, waveshaper, noise, PADsynth, and phase distortion.

3. 10 filter modes.

4. flexible modulation and mixdown options, plus effects.

Drumkv1 is an old-school drum-kit sampler synthesizer with stereo effects.

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.

Synthesis ToolKit in C++ (STK) is a set of audio signal processing and algorithmic synthesis classes written in C++.

This package also provides its demo project, examples, ElectricGuitar, RagaMatic and Effects.

MuseScore is a music score typesetter. Its main purpose is the creation of high-quality engraved musical scores in a WYSIWYG environment.

It supports unlimited staves, linked parts and part extraction, tablature, MIDI input, percussion notation, cross-staff beaming, automatic transposition, lyrics (multiple verses), fretboard diagrams, and in general everything commonly used in sheet music. Style options and style sheets to change the appearance and layout are provided.

MuseScore can also play back scores through the built-in sequencer and SoundFont sample library.

Pure Data (aka Pd) is a visual programming language. Pd enables musicians, visual artists, performers, researchers, and developers to create software graphically, without writing lines of code. Pd is used to process and generate sound, video, 2D/3D graphics, and interface sensors, input devices, and MIDI. Pd can easily work over local and remote networks to integrate wearable technology, motor systems, lighting rigs, and other equipment. Pd is suitable for learning basic multimedia processing and visual programming methods as well as for realizing complex systems for large-scale projects.

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.

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

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

This package provides the LV2 plugin "GxSuppaToneBender", a simulation modelled after the Vox Suppa Tone Bender pedal.

This package provides the LV2 plugin "GxGuvnor", a simulation of an overdrive or distortion pedal for guitars.

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.

Musikcube is a terminal-based music player, library, and streaming audio server.

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.

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