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EZMailer.net has the mailing list solution for your website.

CommuniMail is a mailing list manager and newsletter script

Cosmic Mailer is a simple browser based mailing list to start your own ezine

Subscriber Pro provides an easy to use script that helps you with mailing list

Calculate a distance matrix out of a list of n-dimensional points using scipy.

Mail Machine helps you to manage a small mailing list on a personal website

Inflate a huge list, thus it need a lot of memory

CommuniMail - Mailing List Manager & Newsletter Script

Here is a simple program that can average a list of numbers.

NP Subscriber is the best choice for webmasters seeking a powerful mailing list