A commercial product for many years, the Composer's Desktop Project software was released under a GNU license last year.
From their website:
A free download of our core sound transformation & editing software and documentation is now available. It is being released under a GNU Lesser General Public Licence (LGPL) and includes our full Release 7 package, the Sound Loom GUI (MAC/PC) and now the Soundshaper GUI (PC). Visit the CDP System and the Options tabs for more information. The two existing CDP Tutorial Workshops will also be a free download – for these please click on the Workshops tab. There have now been over a terabyte of free downloads.
Download here:
http://www.unstablesound.net/cdp.html
More info: http://www.composersdesktop.com/cdpsystem.html
Composers Desktop Project Release 7.0
CDP System Free Download Page
For Microsoft Windows™ & MAC OS X™
The CDP-Wishart Libraries: Unusual functions designed by Trevor Wishart help you to create original sounds, textures and effects
From their website:
A free download of our core sound transformation & editing software and documentation is now available. It is being released under a GNU Lesser General Public Licence (LGPL) and includes our full Release 7 package, the Sound Loom GUI (MAC/PC) and now the Soundshaper GUI (PC). Visit the CDP System and the Options tabs for more information. The two existing CDP Tutorial Workshops will also be a free download – for these please click on the Workshops tab. There have now been over a terabyte of free downloads.
Download here:
http://www.unstablesound.net/cdp.html
More info: http://www.composersdesktop.com/cdpsystem.html
Composers Desktop Project Release 7.0
CDP System Free Download Page
For Microsoft Windows™ & MAC OS X™
The CDP-Wishart Libraries: Unusual functions designed by Trevor Wishart help you to create original sounds, textures and effects
~ Surgical Work Inside Sounds Produces Innovative Effects ~
NOW A FREE DOWNLOAD! Some Composition Goals ⇔ Relevant CDP Processes Add some serious gritCDP: 23 ways to reshape sounds using wavecycle distortionHarmony definition and changeCDP: Time-varying filter banks; snap to (changing) harmonic grids in multi-event texturesSeamless mixing of sonic featuresCDP: Numerous ways to combine/reconstruct selected components of soundsTexture & shuffle the insides of soundsCDP: Especially strong on segmentation and internal reorderingGradual changeCDP: Almost every parameter can be made musically supple via user-specified time value 'breakpoint' filesTransitions between soundsCDP: Morph, Bridge, Gliss, CrossoversRoughen surface textureCDP: Granular manipulations with Brassage and 15 grain-handling functionsIntroduce speech-like qualitiesCDP: Impose vowel-like formant shapes onto soundsTextures shaped with pitch, density & rhythmCDP: Multi-event texture creation with 25 parameters, most of which are time-varying. Facilities include upper and lower pitch-shape contours, density controls, defined rhythmic and melodic motifs, harmonic fields and contrapuntal layers. Build sounds through mixingCDP: Mix up to 50 sounds in one track; programs which create multi-event outputs are in effect semi-algorithmic mixers.Work with multi-channel soundfilesCDP: 14 programs with which to compose spatially
Technical Requirements A number of technical details (see System Requirements) will help to orient the prospective user. Note that the CDP software will run under Windows 7, both the 32-bit and the 64-bit 'Home' and 'Premium' editions. CDP on the MAC works well up to Mountain Lion, but installation on 'Mavericks' still requires an extra manual step on the part of the user.