• Coollist
A web-based system for anyone to easily create FREE mailing lists.

• EGroups
eGroups is a free email group service that allows you to easily create and join email groups

• Smartgroups.com
SmartGroups.com is a FREE internet service designed for clubs, societies, associations, or any group of friends & colleagues.

• Spread
Spread is a toolkit and daemon that provide multicast and group communications support to applications across local and wide area networks

• Topica List
Free Internet service that allows you to easily find, manage and participate in email lists.