There are some pretty good free and open source RAW image editing software that photographers can use to enhance the images they capture with their cameras. RawTherapee, UFRaw and Darktable comes to mind. But if you are a professional photographer who need to process large volumes of high quality images in a fast and efficient workflow, be prepared to shell out a couple of hundred bucks for a software that handles the entire process of transferring pictures from a digital camera, organizing them into categories and processing them in a bunch.