Entropius writes: RawTherapee, a flexible geek-friendly RAW converter for Linux and Windows, has just released its new version (with major UI improvements) under the GPL; it was previously proprietary but free. It uses selectable, unique demosaicing algorithms that are both resistant to Bayer artifacts and produce sharp, detailed results; see the comparison page. I've found it in the past to be the best Linux RAW converter available. The new UI improvements mean that its combination of usability, geek-friendliness, and sharp results is strong competition for ACR/Silkypix/whatever on Windows, and further improvements should no doubt follow now that the community can hack on it. Link to Original Source
"The fundamental principle of science, the definition almost, is this: the
sole test of the validity of any idea is experiment."
-- Richard P. Feynman