Rawzor is a proprietary lossless image compression software which compresses camera raw images without any loss in image quality or meta-information.
It is available for Microsoft Windows and Mac OS X. Rawzor has released a free SDK using which many image processing software provide support to open and edit Rawzor compressed images.
SDK is available for 32-bit and 64-bit Windows, Mac OS X and Linux.
Some of the software supporting Rawzor compressed .rwz images: Rawzor compressed photos have .rwz extension.
Rawzor compressed images can be decompressed to get back the image file in its original format.