Mailing List Servers: Provide complete email list subscription management. List hosting, subscribes, unsubscribes, mailings, etc. 

eGroups -
http://www.egroups.com

Onelist -
http://www.onelist.com

ListBot -
http://www.listbot.com

The Internet Gazette -
http://www.internetgazette.net/listhosting.html

Mailing List Service -
http://www.maillists.com

OakNet Publishing -
http://www.oaknetpub.com

server.com -
http://www.server.com

PostMasterDirect -
http://www.postmasterdirect.com

Mailing List Software: Handles Internet list management activities.

LISTSERV -
http://www.lsoft.com/listserv.stm

Majordomo -
http://www.greatcircle.com/majordomo/

Lyris -
http://www.lyris.com

ListProc Mailing List Management -
http://www.cren.net/listproc/index.html

Email Programs: Enable you to send and receive email messages.

Eudora Light -
http://www.eudora.com/eudorapro/demos/

Postman -
http://www.creativenet.net/postman/

Pegasus -
http://www.pegasus.usa.com3

Outlook 98 -
http://www.microsoft.com/office/98/
Outlook/brochure/default.htm

CGI Scripts: Scripts to help you run your online mailing lists.

CGI-Subscribe v1.4 - A simple web interface which allows users to add their name and email address to a list. With the admin interface, you can send out periodic messages to everyone on your list, change your password, or delete a subscriber.

List Mail - A powerful hands-free mailing list manager that allows you to create multiple mailing lists. This program allows you to easily maintain your mailing list via the web. Your subscribers can create and send mail to all members of the list directly from their browser.

Mail Machine 3.6 - A great mailing list script that allows visitors to your website to subscribe and unsubscribe to your mailing list without any work from the list owner.

Mailing List V.1.0 - Enables you to collect email addresses from your visitors to send news-letters or announcements. It will check if an email address is already in the database before adding it. Members can unsubscribe directly from your website if don't want to be on your list anymore.

MAILNEWS 1.3 - This script helps you to maintain a mailinglist. Users can easily subscribe or unsubscribe via a form on your site. Admin features a list of all members, enables subscribing and unsubscribing of users and provides emailing capabilities.

Opt-Email - The optimal way to build an electronic mailing list. All of the recipients on your list are there voluntarily because they are interested in your information.

Perlfect Subscribe Version 1.0 - A simple script that allows your users to add their email address to an email list. This enables you to create mailing lists of users that are interested in receiving updates, notifications or newsletters.

Power List 1.3 - A good mailing list manager with many features including; Password protection for outgoing mail, Easy to use and setup, Admin deletion of multiple emails at one time, User subscribe and unsubscribe, Option for url in email messages for users to remove themselves and Supports many many emails addresses.