HexTools is a collection of tools which I wrote as an aide for reverse engineering proprietery binary file formats.
The included tools are:
hexdump is an advanced hex dumping program. Hexdump allows you to specify exactly how you want the data presented, and exactly which data you want to be presented.
hexdiff is a diff tool designed to dump readable hex diffs between two files. It employs a simple diff algorithm, simply comparing 16 bytes at a time. This basic diff algorithm is useful for viewing changes in file formats created with different variations.