Newsgroups / Usenet

Newega is a Usenet reader with a Web-based interface. It's a stand-alone program (no Web or database server needed), is cross-platform, and has support for themes using HTML templates.

http://freshmeat.net/projects/newega/
Xnews

Abilon
Abilon - fast, small, powerful and freeware RSS Aggregator, newsreader.
http://www.freewarefiles.com/programs.php?ProgramID=9694&categoryid=5&subcategoryid=59
Mozilla Thunderbird
The e-mail and newsgroup client for 2004 and beyond.
http://www.freewarefiles.com/programs.php?ProgramID=9700&categoryid=5&subcategoryid=55
Free Agent
Free Agent is your guide to news, fun and information in the Usenet newsgroups.
http://www.freewarefiles.com/programs.php?ProgramID=390&categoryid=5&subcategoryid=59
Virtual Access
http://sourceforge.net/projects/virtual-access/
MesNews
http://www.zoo-logique.org/mesnews/