Very easy to use and quick to setup. I have used it personally.
Mailman 3 - Dedicated Mailman 3 installation. Unlimited lists/configuration. Free subdomain at mailman3.com. Dedicated support for list admins.
SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
NZBGet - The most efficient usenet downloader.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GrabIt - GrabIt is a free application that enables you to easily find and download content from Usenet news...