Qsynth is a GUI front-end application for the FluidSynth SoundFont synthesizer written in C++.

This is a free software version of SGI's audiofile library. It provides a uniform programming interface for processing of audio data to and from audio files of many common formats.

Currently supported file formats include AIFF/AIFF-C, WAVE, and NeXT/Sun .snd/.au, BICS, and raw data. Supported compression formats are currently G.711 mu-law and A-law.

Autotalent is a LADSPA plugin for real-time pitch-correction. Among its controls are allowable notes, strength of correction, LFO for vibrato and formant warp.

TiMidity++ is a software synthesizer. It can play MIDI files by converting them into PCM waveform data; give it a MIDI data along with digital instrument data files, then it synthesizes them in real-time, and plays. It can not only play sounds, but also can save the generated waveforms into hard disks as various audio file formats.

python-resampy implements the band-limited sinc interpolation method for sampling rate conversion as described by Julius O. Smith at the Digital Audio Resampling Home Page.

This package provides a simple sound library for C++.

RSound allows you to send audio from an application and transfer it directly to a different computer on your LAN network. It is an audio daemon with a much different focus than most other audio daemons.

Ableton Link is a C++ library that synchronizes musical beat, tempo, and phase across multiple applications running on one or more devices. Applications on devices connected to a local network discover each other automatically and form a musical session in which each participant can perform independently: anyone can start or stop while still staying in time.

Rakarrack is a richly featured multi-effects processor emulating a guitar effects pedalboard. Effects include compressor, expander, noise gate, equalizers, exciter, flangers, chorus, various delay and reverb effects, distortion modules and many more. Most of the effects engine is built from modules found in the excellent software synthesizer ZynAddSubFX. Presets and user interface are optimized for guitar, but Rakarrack processes signals in stereo while it does not apply internal band-limiting filtering, and thus is well suited to all musical instruments and vocals.

Cubeb is Mozilla's cross-platform audio library.

Tenacity is a multi-track audio editor designed for recording, playing and editing digital audio. It features digital effects and spectrum analysis tools.

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.

Calf Studio Gear is an audio plug-in pack for LV2 and JACK environments. The suite contains lots of effects (delay, modulation, signal processing, filters, equalizers, dynamics, distortion and mastering effects), instruments (SF2 player, organ simulator and a monophonic synthesizer) and tools (analyzer, mono/stereo tools, crossovers).

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).

yabridge is Yet Another way to use Windows audio plugins. It supports using Windows VST2, VST3, and CLAP plugins in plugin hosts as if they were native plugins, with optional support for plugin groups to enable inter-plugin communication for VST2 plugins and quick startup times.

LV2 port of CAPS, a collection of audio plugins comprising basic virtual guitar amplification and a small range of classic effects, signal processors and generators of mostly elementary and occasionally exotic nature.

RtMidi is a set of C++ classes (RtMidiIn, RtMidiOut, and API specific classes) that provide a common cross-platform API for realtime MIDI input/output.

lv2lint is an LV2 lint-like tool that checks whether a given plugin and its UI(s) match up with the provided metadata and adhere to well-known best practices.

OpenAL provides capabilities for playing audio in a virtual 3D environment. Distance attenuation, doppler shift, and directional sound emitters are among the features handled by the API. More advanced effects, including air absorption, occlusion, and environmental reverb, are available through the EFX extension. It also facilitates streaming audio, multi-channel buffers, and audio capture.

RtMidi is a set of C++ classes (RtMidiIn, RtMidiOut, and API specific classes) that provide a common cross-platform API for realtime MIDI input/output.

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.

An LV2 port of the mda EPiano VSTi.

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

Gnaural is a programmable auditory binaural beat synthesizer intended to be used for brainwave entrainment. Gnaural supports creation of binaural beat tracks of different frequencies and exporting of tracks into different audio formats. Gnaural can also be linked over the internet with other Gnaural instances, allowing synchronous sessions between many users.