PortAudio is a free, cross-platform, open-source, audio I/O library.  It lets you write simple audio programs in 'C' or C++ that will compile and run on many platforms. It provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.

PortAudio - Cross-platform Audio I/O Library

Libav is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata. Its libraries include
<ul>
<li><code>libavcodec</code> provides implementation of a wider range of codecs.</li>
<li><code>libavformat</code> implements streaming protocols, container formats and basic I/O access.</li>
<li><code>libavutil</code> includes hashers, decompressors and miscellaneous utility functions.</li>
<li><code>libavfilter</code> provides a mean to alter decoded Audio and Video through chain of filters.</li>
<li><code>libavdevice</code> provides an abstraction to access capture and playback devices.</li>
<li><code>libavresample</code> implements audio mixing and resampling routines.</li>
<li><code>libswscale</code> implements color conversion and scaling routines.</li>
</ul>

Libav is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libav - Audio and video processing tools

SoX is the Swiss Army Knife of sound processing utilities. It can convert audio files to other popular audio file types and also apply sound effects and filters during the conversion. SoX can play and record audio files on most platforms.





SOX - Sound Processing Utilities

Sayonara is a small, clear and fast audio player for Linux written in C++, supported by the Qt framework. It uses GStreamer as audio backend. It supports Many supported music and playlist formats, Media library with fast search function, Dynamic playback, Equalizer, MP3 Converter, Radio streaming, Multimedia Keys and lot more.

Sayonara-player - Platform independent music player written in C++

PulseAudio is a networked sound server, similar in theory to the Enlightened Sound Daemon (EsounD). Its functions include Software mixing of multiple audio streams, bypassing any restrictions the hardware has, Network transparency, allowing an application to play back or record audio on a different machine than the one it is running on, Sound API abstraction, Generic hardware abstraction and lot more.

PulseAudio - Networked sound server

RhythmBox is an MP3/OGG player for Linux and the GNOME desktop. It features easy playlist edition, CD-ripping, MP3 walkman support, Audio CD burning and internet radio playback. Its interface is strongly based on Apple's iTunes.

RhythmBox - A Music playing application for GNOME

 WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode. For version 5.0.0, several new file formats and lossless DSD audio compression were added, making WavPack a universal audio archiving solution. 
<BR><BR>
In the default lossless mode WavPack acts just like a WinZip compressor for audio files. However, unlike MP3 or WMA encoding which can affect the sound quality, not a single bit of the original information is lost, so there's no chance of degradation. This makes lossless mode ideal for archiving audio material or any other situation where quality is paramount. The compression ratio depends on the source material, but generally is between 30% and 70%.

 WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode. For version 5.0.0, several new file formats and lossless DSD audio compression were added, making WavPack a universal audio archiving solution. 

WavPack - Hybrid Lossless Wavefile Compressor

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PortAudio - Cross-platform Audio I/O Library

Libav - Audio and video processing tools

SOX - Sound Processing Utilities

Sayonara-player - Platform independent music player written in C++

PulseAudio - Networked sound server

RhythmBox - A Music playing application for GNOME

WavPack - Hybrid Lossless Wavefile Compressor

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PortAudio - Cross-platform Audio I/O Library

Libav - Audio and video processing tools

SOX - Sound Processing Utilities

Sayonara-player - Platform independent music player written in C++

PulseAudio - Networked sound server

RhythmBox - A Music playing application for GNOME

WavPack - Hybrid Lossless Wavefile Compressor

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