Magic Lantern is a free software add-on that runs from the SD/CF card and adds a host of new features to Canon EOS cameras that weren't included from the factory by Canon.

After several years of trial and error, I finally have a complete RAW photography workflow in Linux that I am happy with.

The applications in this workflow aren’t just native to Linux, they are also free, open source software (FOSS). There is no need to dual boot, use WINE or a virtual machine. It’s a pure FOSS photography workflow running in Linux.