NewsHunter 3 "NewsHunter3 is an online/offline news reader that supports real time article queueing, 'virtual servers', automatic or manual assembly and decoding of binary files including yEnc. The Server List window monitors all news readers. This means you can reduce NewsHunter3 to a single window which displays all activity for all connections."
New:
MT-NewsWatcher version 3.5.1 Universal binary by Simon Fraser
Xnntp by F. Zschocke is a free, native COCOA, nntp-newsreader available for Mac OS X 10.3.9 and 10.4 with Spotlight integration. Currently in beta -- testers are needed.
Halime online and offline reader for OS X (Cocoa app, not Carbon). No longer in development; source code is available.
Hogwasher by Asar, Inc. does news and e-mail. "When is a 'free' newsreader not free? When it costs you money in download charges. Hogwasher is the only Mac newsreader to offer 'virtual servers': the ability to combine articles across multiple servers, thus saving you time and money. Hogwasher sets the standard for Mac newsreaders in both ease of use and power. Outlook Express users will appreciate it's optional multi-pane interface. And all users will appreciate it's email client and support of all common encodings including yEnc. OS X and Classic." If you use or have tried Version 4, let me know what you think of the text snippet feature!
Nemo by Malcom mac software is a "Newsgroups/Usenet reader made for Mac OS X. You can follow your favourite discussion with an elegant and powerfull user-interface that is designed to look and behave like an Apple Application. It also uses the most recent Mac OS X technlogies like WebKit and Spotlight. Nemo is a native Cocoa Application available both in Intel and PPC platform (Universal Binary)."
Netscape (link is to their download archive) puts a newsreader in some versions of their software. (latest version is here)
NewsCarrier by Daniele aka Malcom. "The goal of this new app is to create afree-opensource complete newsreader designed around the best GUIexperience ever made, Aqua."
NewsFlash (sourceforge Open Source) "features a gorgeous non-blocking Aqua GUI married to an architecture which supports multiple NNTP news servers, multiple concurrent operations and true (by reference) article threading." No longer in development, but source is available.
Osiris "A drag and drop application to post a folder or folders of files to specified newgroups using Thoth or MT-NewsWatcher. OS X only." Supports yenc encoding.
NewsWatcher-X is a port by Electric Fish, porting NewsWatcher to the Carbon API. It runs native under the Mac OS X public beta.
OSXNews an online OS X (written for Cooca) by Anurodh Pokharel.
Pineapple News for Mac OS X by Allen Brunson. "Pineapple News is a USENET newsreader for Mac OS X. It is primarily an offline reader, but it has features and user interface conventions that make it easy to use online also. It uses the traditional three-pane paradigm. The program is easy to set up and use."
Xnntp by F. Zschocke is a free, native COCOA, nntp-newsreader available for Mac OS X 10.3.9 and 10.4 with Spotlight integration. Currently in beta -- testers are needed.
Alexandra by Erik Doernenburg, for NeXTStep (and maybe someday OS X).
Ginko (sourceforge) "An offline mail and news client for OpenStep platforms. Initial targets are Mac OS X and GNUstep. Ginko will provide a unified view on mail and news while being optimized for offline work."
