AccuRaw Monochrome is a raw image editor and developer specifically for creating monochrome images. Raw file formats from most camera manufacturers are supported, for example Nikon NEF files, Canon CR2 files, Leica DNG files, etc. AccuRaw also provides state-of-the-art processing for Fuji X-Trans based camera such as the X-Pro 1, X-E1 and X100s. A full list of supported cameras is on the product web site.
Note: (a) AccuRaw monochrome only converts to monochrome, and (b) AccuRaw Monochrome doesn't do noise reduction or lens corrections - the image you get is the image your camera saw.