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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 including Windows, Macintosh OS X, and Unix (OSS/ALSA). It is intended to promote the exchange of audio software between developers on different platforms. Many applications use PortAudio for Audio I/O. PortAudio 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.

Sndio is a small audio and MIDI framework part of the OpenBSD project. It provides an lightweight audio & MIDI server and a fully documented user-space API to access either the server or directly the hardware in a uniform way. Sndio is designed to work for desktop applications, but pays special attention to synchronization mechanisms and reliability required by music applications. Reliability through simplicity are part of the project goals.

The LinuxSampler project was founded with the goal to produce a free, streaming capable open source pure software audio sampler with professional grade features, comparable to both hardware and commercial Windows/Mac software samplers and to introduce new features not yet available by any other sampler in the world.

Monkey's Audio Codec is a lossless audio codec with good correspondence of compression (and decompression) ratio and time. Monkey's Audio Codec can be used for personal, educational and non-commercial purposes. Commercial usage requires prior written permission from Monkey's Audio author. This is community-maintained Unix port of earlier Monkey's Audio sources; it does not correspond to current official SDK releases (4.x).

MilkyTracker is an open source, multi-platform music application for creating .MOD and .XM module files. It attempts to recreate the module replay and user experience of the popular DOS program Fasttracker II, with special playback modes available for improved Amiga ProTracker 2/3 compatibility.

Mixxx is software for DJ'ing. You can use wave based audio files, Ogg Vorbis and MP3 files as audio input. Mixxx can be controlled through the GUI and with external controllers including MIDI devices, joysticks, and more.

A real-time signal analysis tool and an offline time-frequency browser. It has a built in tone generation capability and it can play back audio files with a multitude of effects and filters. Designed for environmental analysis missions that range from modulation parameter measurements to searching for transient signals that go bump in the night, baudline combines fast digital signal processing, versatile high-speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.

Musepack is an audio compression format with a strong emphasis on high quality. It's not lossless, but it is designed for transparency, so that you won't be able to hear differences between the original wave file and the much smaller MPC file. It is based on the MPEG-1 Layer-2 / MP2 algorithms, but has rapidly developed and vastly improved and is now at an advanced stage in which it contains heavily optimized and patentless code.

KDE IOSlave for accessing audio CDs.

The idea behind OpenAL is a 3d positional spatialized sound library analogous to OpenGL: instead of micromanaging each aspect of sound playback and effect, the application writer may limit themselves to placing the sounds in the scene and letting the native OpenAL implementation determine the correct amount of pitch alteration, gain attenuation, phase shift, etc, required to render the sounds correctly. That's the goal, anyway.