RawDigger is a computer program intended for viewing, studying, and analyzing raw files from digital photo cameras and some digital video cameras. RawDigger allows the user to View the original pixel values in the raw file.

RawDigger version 0.9.14 is out, adds new functionality, bugfixes, and a slew of new suported cameras (Notably, X-E1, 6D, EOS M, GH3, D600, p7700, XF1, and many more)

RawDigger is a cool Raw app that does many good things, costs nothing, and is compatible with Windows (32 & 64bit) and Mac OS. Changelog:

New functionality and major improvements
The list of recently opened files is moved to a separate sub-menu and now has slots for 25 files.
Added convenience for processing color targets for profiling and field (non-)uniformity analysis (Selection Grid).
Added an option to filter out bad pixels in raw files produced by Panasonic cameras.
Changed the display of metadata in raw files: 
Added: display of type of metering, exposure compensation, lens used, focal distance. . . . read more

Selected Items
Click to close the selection preview
Compare List
Teleconverters: Click to see the selected items
Click to Compare the selected items
Flashes: Click to see the selected items
Click to Compare the selected items
Lenses: Click to see the selected items
Click to Compare the selected items
Cameras: Click to see the selected items
Click to Compare the selected items