MANKSA A program for evaluating newsreaders
Windows Newsreaders
Combined news and mail readers for Unix and other platforms
NewsReaders.com an index of Newsreaders
IMAP clients for Unix, many of which can be coerced into reading newsgroups through IMAP
tin.org - TIN development headquarters Tin is a newsreader with versions for Unix, Windows, and OS/2
Don't Write a Newsreader. Why you should not write a new newsreader from scratch
Usenet Rapid Knowledge Transfer a collection of information for authors of newsreader software