Entropius (188861) 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