AnonyNews is a news server and client package where all posts are completely anonymous. It operates as a single newsroom on a network, so users do not need to configure the client. It uses threaded messages so you can see who replied to what, and is designed to allow completely anonymous posting. It's main use is envisaged within the Local Area Network of a specific company. Suggestions can be posted anonymously, or responses to new ideas collected without fear of reprisals.
colobus is a news (nntp) server written in perl that serves up ezmlm mailing list archives as newsgroups. colobus requires the DBI, Digest::MD5, and Mail::Address perl modules, available from CPAN.
The DNews News Server is an advanced news server software that makes it easy for you to provide users with fast access to Internet (Usenet) news groups. Installing your own local news server software also gives you complete control to create your own private or public discussion forums for enhanced communications across the organization and Internet.
Newsstar fetches news and posts it to a local server, usually INN. It has also been reported to work with sn, using some extra scripts etc.
Noffle is a Usenet news server optimized for few users and low speed dial-up connections to the Internet. It acts as a server to news clients running on the local host, but gets its news feed by acting as a client to a remote server.
Papercut is a NNTP server written in Python. Its main objective is to integrate existing web based message board software (Phorum is one of the supported ones) with an Usenet front-end. However, its extensibility enables developers to write their own containers for the storage of the Usenet articles (messages). That means that the code is extensible enough that _you_ could write new containers to integrate the news server with other web message board projects or even other ways to store the messages.
The WendzelNNTPd is a small, easy to configure NNTP server for Unix, Linux, and Windows. The server is IPv6-ready, only supports the most important NNTP commands, is secure, and uses an SQL backend. The main target on the development of the WendzelNNTPd was to create an Usenet server everybody can use.