LightZone is now a open source project

http://lightzoneproject.org/node/190


LightZone is professional-level digital darkroom software for Windows, Mac 
OS X, and Linux. Rather than using layers as many other photo editors do, 
LightZone lets the user build up a stack of tools which can be rearranged, 
turned off and on, and removed from the stack. It's a non-destructive 
editor, where any of the tools can be re-adjusted or modified later — even 
in a different editing session. A tool stack can be copied to a batch of 
photos at one time. LightZone operates in a 16-bit linear color space with 
the wide gamut of ProPhoto RGB.


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