The WendzelNNTPd is an IPv6-ready Usenet server that aims to be as easy to use as possible. It is portable, supports AUTHINFO authentication, contains ACLs as well as role based ACLs (RBAC), supports invisible newsgroups, and features automatic prevention of double postings. WendzelNNTPd supports MySQL as well as SQlite3 backends.
zfec is a fast, portable, and programmable implementation of erasure coding. It includes a C library, a Python library, and a command-line tool. Erasure coding is also known as "forward error correction", which is the generation of redundant blocks of information such that if some blocks are lost then the original data can be recovered from the remaining blocks. The RAID-5 algorithm is an erasure code, but while RAID-5 can recover from the loss of any one element, zfec can be parameterized to choose in advance the number of elements whose loss it can tolerate.
Leafnode is a news server, suitable for small, limited-bandwidth sites with only a few users (and useful for offline news reading). Leafnode keeps track of which groups are being read and downloads only articles in those groups. Leafnode has been designed to require no maintenance and to be easy to set up.
INN (InterNetNews) is an extremely flexible and configurable Usenet / netnews news server. It supports accepting articles via either NNTP connections or via UUCP, as well as serving out articles to reading clients via NNTP. It supports multiple different ways of sending outgoing articles to other hosts, as well as multiple different storage mechanisms for articles and article overview information via internal APIs. Compared to other news servers, INN is more complicated with a steeper learning curve, but is extremely flexible and configurable, comes with a large suite of supporting programs, and supports embedded filters in either Perl or Python.
Claws Mail is a GTK+ based, lightweight, and fast email client. Almost all commands are accessible with the keyboard. It also has many features such as multiple accounts, POP3/SMTP/IMAP/NNTP support, OpenSSL, GnuPG, and LDAP support, a plugin system, spell checking, filtering, Actions, spam and virus filters, an address book, internationalization, and much more.
Korallenriff is a program that collects input from different network sources and stores their data into one database. For example, it can receive POP3 mail or can fetch NNTP groups and store the received messages in a database. One can then, for example, use the database data within a Web site to display the latest postings of a newsgroup or to create an online mailing list archive. Another possible use would be to build a blogging-software where one can post via email.
Newsstar fetches news and posts it to a local news server: INN, s-news, and sn are supported. What makes newsstar special is that it can make multiple simultaneous connections, not only to one server, but to several, supporting up to 10 "threads". Before fetching each article, it checks that it hasn't already been downloaded by another thread or in a previous session. It can also "pipeline" article requests to make better use of available bandwidth. SSL is supported.