Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.

Galette - Galette is a membership management web application towards non profit organizations.

NZBGet - The most efficient usenet downloader.

Bigtent - BigTent is a web-based organization and communication portal for groups.

GrabIt - GrabIt is a free application that enables you to easily find and download content from Usenet news...