sn is a small news system for sites which serve perhaps a few dozen newsgroups, and which have a slow connection to the Internet. The target user is a home or SOHO with a single modem connection to the Internet and serving a few workstations. sn also includes a mail-to-news filter.
Turquoise SuperStat reads the contents of a Fidonet message area in one of its supported formats or Usenet news groups and creates toplists over massive quoters, senders, original content per message, Fidonet nets (Fidonet only), Internet topdomains, receivers (Fidonet only), subjects, and used software, as well as graphs over posting by weekday and time of day. It supports Squish, *.MSG, FDAPX/w, JAM, MyPoint, and tanstaafl's message area base format, as well as Usenet news groups over NNTP or in news spools. Command line and GUI versions are included.
LottaNZB aims to simplify and automate downloading of binary news from Usenet. You can tell it what to download using NZB files, which are created by many Usenet search engines. It integrates nicely with GNOME desktops, but is not limited to them, and uses the mature SABnzbd software as its foundation.
KLibido is a Usenet (NNTP) file grabber for KDE. Among its features it includes a multi-tabbed graphical interface to display the article list, .nzb (newzbin) files download, automatic joining/decoding of articles, multiple server support, multiple download threads per server, and management of the download queue.
MyNewsGroups :) is a USENET news client with a completely Web-based interface. It is written in PHP4, and uses a database backend. Its main purpose is to mirror all messages from subcribed public newsgroups into a database, and add extra features such as saving articles per user, statistics on users, search functions, and so on. MyNewsGroups :) is aimed at people that have a Web site and want offer their users direct access to newsgroups of same subject.
Microbrew MicroSieve is designed to be a high speed spam filter for USENET news. Given the large amount of spam riding around in major USENET news systems, a spam filter has to be very fast and remain effective. It checks for duplicate and large articles, spambots, and binaries in non-binary groups. It also has path-based auto-accept and auto-reject, as well as cross-post limiting.