MD5 Mac OS X application can be used for both checking the hashes for existing files, as well as for creating new hashes for the files located on your computer.
The software works flawlessly, the only thing I would like to see in the new version is support for actual MD5 files that don't have .md5 extension. A number of download sites offer MD5 hashes in files with a format such as software.md5.txt, so this would be a nice addition.
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