LightZone was a paid program for photographic post-processing until 2011 when the company folded. Since then, LZ devotees have taken the now Open Source code and continued the development as FOSS for Windows and Linux. Interested in LightRoom but can't afford Adobe's premium prices? How about this one for free. A link to the story on PetaPixel and an 8 minute video on how to edit using the software are below. Enjoy!