From Chaotic Software:
Chaotic Converter is an essential software developer's tool, intended to assist your efforts in converting between various common data formats.
To use Chaotic Converter, just launch the app, and enter data into any of the many fields of the converter. The same data will be shown in all the various formats. You can also add/subtract/XOR/MOD/OR/etc. any value to the current value by using any of the button/textfield pairs on the right of the window. There are also many value modifier buttons at the bottom left of the window. Using these you can quickly endian swap the current value, or shift/rotate/reverse the value.