TwoLAME is an optimised MPEG Audio Layer 2 (MP2) encoder based on tooLAME by Mike Cheng, which in turn is based upon the ISO dist10 code and portions of LAME.

Snd is a sound editor modelled loosely after Emacs. It can be customized and extended using either the s7 Scheme implementation (included in the Snd sources), Ruby, or Forth.

XJackFreak is an audio analysis and equalizing tool for the Jack Audio Connection Kit. It can display the FFT of any input, modify it and output the result.

dsp is an audio processing program with an interactive mode.

The LV2 Toolkit (LVTK) contains libraries that wrap the LV2 C API and extensions into easy to use C++ classes. It is the successor of lv2-c++-tools.

VO-AACENC is the VisualOn implementation of Advanced Audio Coding (AAC) encoder.

aubio is a tool designed for the extraction of annotations from audio signals. Its features include segmenting a sound file before each of its attacks, performing pitch detection, tapping the beat and producing MIDI streams from live audio.

Libxmp is a library that renders module files to PCM data. It supports over 90 mainstream and obscure module formats including Protracker (MOD), Scream Tracker 3 (S3M), Fast Tracker II (XM), and Impulse Tracker (IT).

libkeyfinder is a small C++11 library for estimating the musical key of digital audio.

AdPlug is a hardware independent AdLib sound player library, mainly written in C++. AdPlug plays sound data, originally created for the AdLib (OPL2/3) audio board, on top of an OPL2/3 emulator or by using the real hardware. No OPL2/3 chips are required for playback.

CHOW Tape is an analog tape machine physical model, originally based on the Sony TC-260. The current version can be used to emulate a wide variety of reel-to-reel tape machines.

Python API for Spatially Oriented Format for Acoustics files as specified in SOFA conventions.

AlsaModularSynth is a digital implementation of a classical analog modular synthesizer system. It uses virtual control voltages to control the parameters of the modules. The control voltages which control the frequency e.g. of the VCO (Voltage Controlled Oscillator) and VCF (Voltage Controlled Filter) modules follow the convention of 1V / Octave.

FreePats is a project to create a free and open set of GUS compatible patches that can be used with softsynths such as Timidity and WildMidi.

WebRTC-Audio-Processing library based on Google's implementation of WebRTC.

pyo is a Python module containing classes for a wide variety of audio signal processing types.

With pyo, user will be able to include signal processing chains directly in Python scripts or projects, and to manipulate them in real time through the interpreter. Tools in pyo module offer primitives, like mathematical operations on audio signal, basic signal processing (filters, delays, synthesis generators, etc.), but also complex algorithms to create sound granulation and others creative audio manipulations.

pyo supports OSC protocol (Open Sound Control), to ease communications between softwares, and MIDI protocol, for generating sound events and controlling process parameters. pyo allows creation of sophisticated signal processing chains with all the benefits of a mature, and widely used, general programming language.

python-pysox is a wrapper around the sox command line tool. The API offers Transformer and Combiner classes that allow the user to incrementally build up effects and audio manipulations. python-pysox also provides methods for querying audio information such as sample rate, determining whether an audio file is silent, and much more.

shntool is a multi-purpose WAVE data processing and reporting utility. File formats are abstracted from its core, so it can process any file that contains WAVE data, compressed or not---provided there exists a format module to handle that particular file type. It can also generate CUE files, and use them split WAVE data into multiple files.

TinyALSA is a small library to interface with ALSA in the Linux kernel.

The Bauer stereophonic-to-binaural DSP (bs2b) library and plugins is designed to improve headphone listening of stereo audio records. Recommended for headphone prolonged listening to disable superstereo fatigue without essential distortions.

This package provides a python API to read and write MIDI files.

yabridgectl is a tool to setup and update yabridge.

cyanrip is a command line tool for ripping CDs. It uses MusicBrainz to name and tag each track, and to download and embed cover art. cyanrip supports encoding tracks to multiple formats in parallel and automatically verifies checksums.

The AMB plugins are a set of LADSPA ambisonics plugins, mainly to be used within Ardour. Features include: mono and stereo to B-format panning, horizontal rotator, square, hexagon and cube decoders.