GNU Pth is a portable library providing non-preemptive, priority-based scheduling for multiple execution threads. Each thread has its own program-counter, run-time stack, signal mask and errno variable. Threads are scheduled in a cooperative way, rather than in the standard preemptive way, such that they are managed according to priority and events. However, Pth also features emulation of POSIX.1c threads ("pthreads") for backwards compatibility.

Pulsemixer is a PulseAudio mixer with command-line and curses-style interfaces.

Ponymix is a PulseAudio mixer and volume controller with a command-line interface. In addition, it is possible to use named sources and sinks.

pamixer is like amixer but for PulseAudio, allowing easy control of the volume levels of the sinks (get, set, decrease, increase, toggle mute, etc).

Apulse provides an alternative partial implementation of the PulseAudio API. It consists of a loader script and a number of shared libraries with the same names as from original PulseAudio, so applications could dynamically load them and think they are talking to PulseAudio.

Internally, no separate sound mixing daemon is used. Instead, apulse relies on ALSA's dmix, dsnoop, and plug plugins to handle multiple sound sources and capture streams running at the same time. dmix plugin muxes multiple playback streams; dsnoop plugin allow multiple applications to capture from a single microphone; and plug plugin transparently converts audio between various sample formats, sample rates and channel numbers.

Libsndfile is a C library for reading and writing files containing sampled sound (such as MS Windows WAV and the Apple/SGI AIFF format) through one standard library interface.

It was designed to handle both little-endian (such as WAV) and big-endian (such as AIFF) data, and to compile and run correctly on little-endian (such as Intel and DEC/Compaq Alpha) processor systems as well as big-endian processor systems such as Motorola 68k, Power PC, MIPS and SPARC. Hopefully the design of the library will also make it easy to extend for reading and writing new sound file formats.

Secret Rabbit Code (aka. libsamplerate) is a Sample Rate Converter for audio. One example of where such a thing would be useful is converting audio from the CD sample rate of 44.1kHz to the 48kHz sample rate used by DAT players.

SRC is capable of arbitrary and time varying conversions; from downsampling by a factor of 256 to upsampling by the same factor. Arbitrary in this case means that the ratio of input and output sample rates can be an irrational number. The conversion ratio can also vary with time for speeding up and slowing down effects.

SRC provides a small set of converters to allow quality to be traded off against computation cost. The current best converter provides a signal-to-noise ratio of 145dB with -3dB passband extending from DC to 96% of the theoretical best bandwidth for a given pair of input and output sample rates.

PulseAudio is a sound server. It is basically a proxy for your sound applications. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server.

paprefs is a simple GTK based configuration dialog for the PulseAudio sound server. Note that this program can only configure local servers, and requires that a special module module-gsettings is loaded in the sound server.

NoiseTorch creates a virtual PulseAudio microphone that suppresses noise, in any application. Use whichever conferencing or VOIP application you like and simply select the NoiseTorch Virtual Microphone as input to torch the sound of your mechanical keyboard, computer fans, trains and the likes.

PulseAudio Volume Control (pavucontrol) provides a GTK+ graphical user interface to connect to a PulseAudio server and easily control the volume of all clients, sinks, etc.

pasystray enables control of various PulseAudio server settings from the X11 system tray. See the project README.md for a detailed list of features.

This plug-in is meant to suppress a wide range of noise origins: computer fans, offices, crowds, airplanes, cars, trains, construction, and more.

Mild background noise is always suppressed, loud sounds, like clicking of mechanical keyboard, are suppressed while there is no voice however they are only reduced in volume when voice is present.

The plug-in is made to work with 1 or 2 channels (LADSPA plugin), 16 bit, 48000 Hz audio input.

Pumpa is a simple pump.io client written in C++ and Qt.

Purescript is a small strongly, statically typed programming language with expressive types, inspired by Haskell and compiling to JavaScript.

pv is a terminal tool for monitoring the progress of data through a pipeline. It can be inserted into any normal pipeline between two processes. It gives a visual indication of how quickly data is passing through, how much has been transferred and how near to completion it is (with a progress bar), how long it has taken, and an estimate of the remaining time before completion.

PyPy is a faster, alternative implementation of the Python programming language employing a just-in-time compiler. It supports most Python code natively, including C extensions.

PyPy is a faster, alternative implementation of the Python programming language employing a just-in-time compiler. It supports most Python code natively, including C extensions.

Foreign Function Interface for Python calling C code.

Pycparser is a complete parser of the C language, written in pure Python using the PLY parsing library. It parses C code into an AST and can serve as a front-end for C compilers or analysis tools.

This library extends the standard functools Python module with a few extra procedures.

Packaging is a Python module for dealing with Python packages. It offers an interface for working with package versions, names, and dependency information.

toml is a library for parsing and creating Tom's Obvious, Minimal Language (TOML) configuration files.

This hatch plugin allows defining a project description in terms of concatenated fragments that are based on static strings, files and parts of files defined using cut-off points or regular expressions.