Thanks to Jon Gilbert, jong@jong.org, for most of this information.

Mindterm

You can access a java application for ssh called mindterm.

Other Platforms

SSH has been ported to almost all the available operating systems and platforms, so chances are your computer can use it.

Additional SSH Information

Check out the SSH FAQ. There's much much more answered than you could hope for in this document.
OpenSSH.com is a good starting point if you're looking for the UNIX client, some background on SSH, or pointers to goofy looking posters.
SSH Communications Security Ltd is a company founded on the principles of SSH. Their only drawback is that they charge an exobitant fee for their software. But it's a nice site.