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The Pure Data (short Pd) project on SourceForge unifies the extensions (or externals) written for the Pure Data Graphical Computer Music System written by Miller Puckette with contributions from many others.
C++ class library for sound analysis, synthesis, and morphing
Loris is a library for sound analysis, synthesis, and morphing, developed by Kelly Fitz and Lippold Haken at the CERL Sound Group. Loris includes a C++ class library, Python module, C-linkable interface, command line utilities, and documentation.
A C++ library and Python module for audio synthesis featuring dynamic digital filters. Nsound lets you easily shape waveforms and write to disk or plot them. Nsound aims to be as powerful as Csound but easy to use.
FreqTweak is a tool for FFT-based realtime audio spectral manipulation and
display. It provides several algorithms for processing audio data in
the frequency domain with a highly interactive GUI to manipulate and
display the spectral data.
A modular audio programming language, designed to write applications quickly. Its main goal is real time audio processing, but it should be used for any kind of development.
SOMba is a Qt based program that allows multiple dancers to create a collaborative sonic space, using audio clips organized by a Self-Organizing Map. It uses the Marsyas framework for audio feature extraction and playback.