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Wanewsletter is a powerful mailing list manager with such features as: two engine send; Subscribe/confirm/Unsubscribe; Multi list management; Multi users management.
Price: GPL

The Omnistar Mailer is a dynamic contact database and email list manager combined. It will give you the ability to dynamically create forms for obtaining information, create email list campaigns and create customized advanced searches to quickly retrieve your stored information. You may also create your own HTML newsletters using pre-designed templates.
Price: 69.95

Webinsta Mailing list manager was built to provide a centralized mailing list / newsletter system for small to medium website . Its simple yet quite powerfull . It support the standard subscribe and un subscribe , remote verification , unsubscribe links , attachments , no timeouts , import email , Graphical HTML templates , Multilanguage ( English , Dutch , Swedish etc ) and other such features . The best of all the total integration is less than 2 lines of code and can run with or without a database and aimed at a non programmer .
Price: Free

This is a mailing list script written in PHP. It supports multi mailing lists, and includes a script to send out mass mails. WebJeff's Diff is written in French.
Price: Freeware

A Newsletter manager for your Homepage. Sends an eMail to all subscribed users. Saving data in CSV-file, no database required. Easy config and admin (Header, Footer ...). Users can singout themselves. Can send eMails in HTML- or PlainText format. Fully compatible to xNewsletter 1.0.
Price: Free (GPL)

ZWS Newsletter is a php application for creating and managing e-mail newsletters with subscriber mailing list. All aspects of the newsletter management are administered from the ZWS Newsletter control panel which utilizes sessions for login and user administration. You can preview your newsletter in HTML or text format before sending. Add and edit users and subscribers and use the search function to locate e-mails.
Price: Free (GPL)