Rawker is a free program for converting RAW files produced by digital photo cameras into TIFF, PNG or JPEG format.
Rawker allows you to convert a single RAW file or batch process a folder of RAW files. Alternatively, you can set it to automatically scan a specific folder every few seconds. You can modify settings to optimize the appearance of your image and these can be saved in presets or files.
Rawker produces TIFF image files with 16 bits color depth (48 bits per RGB pixel), PNG (16 bits) or JPEG (8 bits). Metadata is preserved throughout the conversions which can be done in one of two modes: using Apple's Core Graphics (Quartz) technology or Dave Coffin's DCRaw tool. DCRaw doesn't need to be installed separately because it's embedded into Rawker. However, there is no way to adjust white balance or the DPI settings for the saved file.
Overall though, Rawker is an immensely useful and free tool for photographers and those needing to perform RAW conversions.