ListBot

Freemailer2000
The Ultimate Free Multi Level Mailing List Builder

Bravenet.com
A good web site with lots of good remotely hosted script

Hostedscript.com
Have your visitors sign up for your mailing list so that you can send them email updates

CGISpy.com Mailing List
A mailing list allows you to keep in touch with your sites users.

Coollist
A Web-based system that allows users to create mailing lists on the Coollist server.

YourMailinglistprovider
YourMailinglistProvider offers webmasters a free remotely hosted maillist

pcReminder
Add a FREE Mailing List Service to your website.

List Server
List Server offers free, professional-looking mailing lists with a subscription page, archive, and easy-to-use members area.

Web Site Post Office
You can create a mailing list for your Web site to keep in touch with your visitors.

eGroups
An easy-to-use Web-based list management system.