http://www.macnn.com/articles/01/02/18/macsecsh.2.1a7:/
MacSecSH 2.1a7: renamed SSH2 utility for Mac
updated 01:45 am EST, Sun February 18, 2001
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Jean-Pierre Stierlin's freeware SSH2 client for the Mac, MacSeSH 2.1a7 (formerly MacSSH) now allows caching of passphrases for encrypted private keys, fixes scripting problems, and improves minimum required system checks. (The documentation notes that older 'MacSSH' preferences need to be renamed.)
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They should not have changed their name, except that they are only using SSH2 which is called SeSH. If I were them I would not have changed their name.