Photivo is a free and open source (GPL3) photo processor. It handles your RAW files as well as your bitmap files. Developed by Michael Munzert
License: Open Source
Photivo offers a comprehensive suite of advanced editing tools and batch processing capabilities, making it ideal for professional photographers. In contrast, UFRaw is lightweight and faster, focusing on raw image processing with a more straightforward interface, but lacks some of the extensive editing features found in Photivo.