Author's words: "ReHash is an easy-to-use console-based hash calculation tool written in C++. It supports many algorithms and output formats and it can be fully configured using some of the many command-line arguments which can be passed to the tool."
This is a nice, straightforward hash sum calculator. Since the files from the original project are very old and there seems to be no maintainance any more, I've "forked" the project here, updated the source and VC++ project files a bit...