The Open MPI Project is an MPI-3 implementation that is developed and maintained by a consortium of academic, research, and industry partners. Open MPI is therefore able to combine the expertise, technologies, and resources from all across the High Performance Computing community in order to build the best MPI library available. Open MPI offers advantages for system and software vendors, application developers and computer science researchers.

hwloc provides a portable abstraction (across OS, versions, architectures, ...) of the hierarchical topology of modern architectures, including NUMA memory nodes, sockets, shared caches, cores and simultaneous multithreading. It also gathers various attributes such as cache and memory information. It primarily aims at helping high-performance computing applications with gathering information about the hardware so as to exploit it accordingly and efficiently.

hwloc may display the topology in multiple convenient formats. It also offers a powerful programming interface to gather information about the hardware, bind processes, and much more.

Gotcha is a library that wraps functions. Tools can use gotcha to install hooks into other libraries, for example putting a wrapper function around libc's malloc. It is similar to LD_PRELOAD, but operates via a programmable API.

MPICH is a high-performance and portable implementation of the Message Passing Interface (MPI) standard (MPI-1, MPI-2 and MPI-3). MPICH provides an MPI implementation that efficiently supports different computation and communication platforms including commodity clusters, high-speed networks (10 Gigabit Ethernet, InfiniBand, Myrinet, Quadrics), and proprietary high-end computing systems (Blue Gene, Cray). It enables research in MPI through a modular framework for other derived implementations.

This package provides Zyn-Fusion user interface for zynaddsubfx.

GNU Mtools is a set of utilities for accessing MS-DOS disks from a GNU or Unix system. It supports long file names and multiple disk formats. It also supports some FAT-specific features such as volume labels and FAT-specific file attributes.

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.

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.

iRRAM is a C++ package for error-free real arithmetic based on the concept of a Real-RAM. Its capabilities range from ordinary arithmetic over trigonometric functions to linear algebra and differential equations. A program using iRRAM is coded in ordinary C++, but may use a special class that behaves like real numbers without any error. Additionally, iRRAM uses the concept of multi-valued functions.

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.

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

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.

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

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.

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 provides the LV2 plugin "GxSlowGear", a slow gear audio effect to produce volume swells.

The Non Session Manager is an API and an implementation for audio session management. NSM clients use a well-specified OSC protocol to communicate with the session management daemon.

Wolf Spectrum is a real-time 2D spectrogram plugin. It is provided as an LV2 plugin and as a standalone Jack application.

DSSI is a plugin API for software instruments with user interfaces, permitting them to be hosted in-process by audio applications. It is intended to be simple, GUI-toolkit-agnostic, and slightly biased towards familiarity with MIDI. The DSSI distribution package contains a JACK/ALSA-sequencer reference host and some plugins as well as the specification and header.

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.

This package provides the Rakarrack effects as LV2 plugins. The ports are done such that hopefully when Rakarrack gets an active maintainer these will get merged into the original project.

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.