c-nocem - NoCeM for C News and INN

Cleanfeed - spam filter for Usenet news servers

A project aimed at development of a collaborative Usenet quality ratings-based message filtering and recommendation service.

A fast, freeware USENET spam filter. Tested on Linux and Solaris platforms with Cyclone and Typhoon news servers.

Usenet spam filtering for CNews

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.

Free Spam Removal Software for News Servers

Information about the NoCeM spam-cancel protocol and links to freely available implementations for INN and C News.

Pronounced "no see 'em", a third-party authenticated system for doing things such as cancels of spam, and off-topic posts.

Cyclone Spam Filters freely available from JEM