HashserGUI is a GUI interface for Jacksum. It is intended to provide a graphical tool to create hashes for files within a directory, and check the hashes generated. It works with many hash functions, as md5, sha1, sha256, sha512, md4, crc, etc.
Project works on Mac OS X 10.9.5 - while the latest JackSum Does Not seem to! This is my #1 recommendation for a Hash Utility on Mac OS X systems.