... and I Quote!!(tm) 

With ... and I Quote!!(tm) you can maintain a database of your favorite quotes. You have full control over when and how often the current quote changes. You also have the ability to automatically append the current quote to your outgoing emails.
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SignGen 

SignGen is a program that generates a unique electronic signature block that can be used to stamp a word document, e-mail or other electronic media as a valid document that requires to be formally authenticated and released by the document creator.
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