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.

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.

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.

This version of Open MPI has an implementation of MPI_Init_thread that provides MPI_THREAD_MULTIPLE. This won't work correctly with all transports (such as openib), and the performance is generally worse than the vanilla openmpi package, which only provides MPI_THREAD_FUNNELED.

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.

The Score-P (Scalable Performance Measurement Infrastructure for Parallel Codes) measurement infrastructure is a scalable and easy-to-use tool suite for profiling, event trace recording, and online analysis of high-performance computing (HPC) applications.

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.

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.

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

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.

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.

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.

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.

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.

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

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.

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.

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

Jack-keyboard is a virtual MIDI keyboard, a program that allows you to send JACK MIDI events (i.e. play) using your PC keyboard.

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

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.