DNG or Digital Negative is a public archival format for RAW files that was introduced by Adobe some time back. This format was introduced so that professional photographers can store RAW files in a public archival format, instead of RAW format that can change from camera to camera.
Free Adobe DNG Converter is a raw file converter that converts RAW files from many common camera manufacturers to standardized DNG format. Converting RAW files to DNG has a big advantage that you can work with same format even if you use multiple different cameras and raw file formats. Also check out Raw file viewer.
Adobe DNG Converter is completely free. It can convert files from more than 300 cameras to standard DNG format. Some of the popular manufacturers supported by Free Adobe DNG Converter are: Sony, Canon, Nikon, Olympus, Panasonic, Samsung, and Pantax.
If you are a professional photographer working with RAW files, try Free Adobe DNG Converter to convert all your RAW files to standard DNG Raw format.
Adobe DNG Converter is available for both Windows, as well as Mac. Download free here.