News Shogun
- An ambitious freely available modification to INN's nnrpd, for stopping abuse from your own users. It also includes more advanced user authentication features than are provided by the stock nnrpd.
- http://www.panix.com/shogun/

Spam Hippo
- Freeware spam removal software for news servers.
- http://www.newsadmin.com/sh/spamhippooverview.htm

Cleanfeed
- Spam filter for Usenet transit servers, scans the incoming newsfeeds for spam and tells the server to reject any it finds. It can also block binary and HTML posts. Written in Perl, can be used on servers running INN, Diablo, Cyclone, Typhoon, Twister, Bre
- http://www.bofh.it/~md/cleanfeed/

Cleanfeed Information
- Page of the previous developer, still includes a useful FAQ section along with a link pointing to the site of the new maintainer.
- http://www.exit109.com/~jeremy/news/cleanfeed/

MicroSieve
- A fast, freeware USENET spam filter. Tested on GNU/Linux and Solaris platforms with Cyclone and Typhoon news servers.
- http://www.microbrew.org/products/usieve/

narf
- Usenet spam filtering for CNews.
- http://utcc.utoronto.ca/abuse/antispam-stuff/narf/

Xpat News
- Cyclone Spam Filters freely available from JEM.
- http://xpat.com/~jem/cyclone/

c-nocem
- A program for easy and efficient application of the NoCeM protocol on the news spool, supports C News and INN news servers.
- http://sites.inka.de/sites/bigred/sw/c-nocem.html

The NoCeM page
- Pronounced "no see 'em", a third-party authenticated system for doing things such as cancels of spam, and off-topic posts.
- http://www.cm.org/