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The Network Audio System is designed for playing, recording, and manipulating audio data over a network. Like the X Window System, it uses the client/server model to separate applications from the specific drivers that control audio input and output devices.

libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms. On FreeBSD, it currently supports: * null output * raw output * AU files * WAV files * OSS (Open Sound System) And optionally: * ESD (ESounD or Enlightened Sound Daemon) * NAS (Network Audio System) * PulseAudio

Aubio is a library for audio labelling. 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. The name aubio comes from 'audio' with a typo: several transcription errors are likely to be found in the results too. The aim of this project is to provide these automatic labelling features to other audio software. Functions can be used offline in sound editors and software samplers, or online in audio effects and virtual instruments.

JACK is a low latency audio server, written for POSIX-conformant operating systems. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. Its clients can run in their own processes (i.e. as normal applications), or can they can run within the JACK server (i.e. as a "plugin"). JACK was designed from the ground up for professional audio work, and its design focuses on two key areas: synchronous execution of all clients, and low latency operation.

Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling. Ecasound supports a wide range of audio inputs, outputs and effect algorithms. Effects and audio objects can be combined in various ways, and their parameters can be controlled by operator objects like oscillators and MIDI-CCs. As most functionality is located in shared libraries, creating alternative user-interfaces is easy. A versatile console mode interface is included in the package.

MPEG Maaate (pronounce: ma:a:it) is a C++ toolkit to parse and analyse audio data in the compressed domain by analysing MPEG-1/2 Layers 1-3 audio files. It makes the encoded fields of an MPEG audio stream accessible (tier1) and provides some content analysis functions like silence detection (tier2). MPEG Maaate is designed in tiers: the first tier implements the parsing of the MPEG audio stream, the second tier implements the content analysis on the extracted field, and the third tier includes any applications that are based on the extracted content.

Siren is a text-based audio player for UNIX-like operating systems. It supports Ogg Vorbis, MP3, FLAC, WavPack, WAVE, AIFF and a few other file formats.

fapg is a tool to generate list of audio files (Wav, MP3, Ogg, etc) in various formats (M3U, PLS, HTML, etc). It is very usefull if you have a large amount of audio files and you want to quickly and frequently build a playlist.

This library provides decoding and encoding of audio on a playlist. It is intended to be used as a backend for music player applications. That said, it is also generic enough to be used as a backend for any streaming audio processing utility. It provides decoding, encoding, resampling, and gain adjustment.

Puddletag is a audio tag editor similar to Windows program Mp3tag. Unlike most taggers, it uses a spreadsheet-like layout so that all the tags you want to edit by hand are visible and easily editable. Supported formats: ID3v1, ID3v2 (mp3), MP4 (mp4, m4a, etc.), VorbisComments (ogg, flac), Musepack (mpc), Monkey's Audio (.ape) and WavPack (wv)