Readers for NewsGroups:
http://dmoz.org/Computers/Software/Internet/Clients/Usenet/
WindoWs NewsReaders:
ForteAgent
GraVity
XNewS http://xnews.newsguy.com/
NewsBin for downloading binary files
http://dmoz.org/Computers/Software/Internet/Clients/Usenet/Windows/
LiNux NewsReaders:
KNode
http://www.newsreaders.com/unix/clients.html
Those were all readers for Newsgroups aka. Usenet,
if you wanted RssNewsfeeds check here