Good Gear Guide
In Pictures: 35 open source and free tools to mana...
The poMMo Project is open source mass-mailing software for adding a mailing list to your website, though it can also be used for standalone mailings. This Web-based system installs in two minutes and is compatible with all common Web hosts. Features of poMMo include flexible mailing management, the ability to create subscriber groups, subscriber base import and export, and WYSIWYG HTML email creation. For user support and discussion, poMMo offers community forums.
In Pictures: 35 open source and free tools to manage your online store