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OptimFROG is a lossless audio compression program. Its main goal is to reduce at maximum the size of audio files, while permitting bit identical restoration for all input. It is similar with the ZIP compression, but it is highly specialized to compress audio data. OptimFROG obtains asymptotically the best lossless audio compression ratios. It has Windows, Linux, and Mac versions, fully featured input plug-ins for the Windows Media Player, foobar2000, Winamp2/3/5, dBpowerAMP, XMPlay, QCD, and XMMS audio players (with bitstream error resilience, ID3v1.1 and APEv2 read tagging support, ID3v2 compatible), optimal support for all integer PCM wave formats up to 32 bits and an extensible streamable (error tolerant) compressed format. It is also fast, the default mode encodes CD quality audio data at 12.4x real-time and decodes at 17.4x real- time on AMD Athlon XP 1800+ (the fastest mode encodes at 28.1x real-time and decodes at 24.7x real-time). Self-extracting (sfx) archives can also be created with a small overhead of just 54 KB.

This is the home page for the Open Source Audio Library Project. This is a project designed to implement a world class set of classes in C++ that will handle all of the audio functions one would like. It is designed to be multi- platform with UNIX based platforms as the base. This project is still in the beta code phase and a beta version that will illustrate the power and flexibility is now available. This version supports the Linux (OSS) audio device, Solaris Sparc audio device, FreeBSD (OSS) audio device, wav, au, aiff, aifc, mp3, and numerous other formats. It is important to note that this is not an application but a C++ library that others can use to create an audio application or to easily add audio capabilities to an existing application.

Open Sound System for FreeBSD is a audio subsystem that provides a cross platform audio and MIDI API with device drivers for most consumer and professional PCI and USB audio devices.

tagged should become a collection of perl tools to read, change and write different tags of MP3 audio files.

A simple command line player for playing 8bit Atari(TM) .sap (Slight Atari Player) audio files.

Practical Music Search is an open source ncurses client for Music Player Daemon, written in C++. The target audience are power users who need an MPD client that is highly configurable and accessible. PMS features a simple but powerful interface similar to Vim, and runs on (at least) Linux and Mac OS X.

Praat (the Dutch word for "talk") is a free scientific computer software package for the analysis of speech in phonetics.

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)

eyeD3 is a Python program/module for processing (reading and writing) ID3 tags. Information about mp3 files (i.e bit rate, sample frequency, play time, etc.) is also available. The formats supported are ID3 v1.0/v1.1 and v2.3/v2.4.

Python Audio Tools are a collection of audio handling programs which work from the command line. These include programs for CD extraction, track conversion from one audio format to another, track renaming and retagging, track identification, CD burning from tracks, and more. Supports internationalized track filenames and metadata using Unicode. Works with high-definition, multi-channel audio as well as CD-quality. Track conversion uses multiple CPUs or CPU cores if available to greatly speed the transcoding process. Track metadata can be retrieved from FreeDB, MusicBrainz or compatible servers.