Tin is a powerful text mode news reader. It features threaded news reading, regex driven killfiles/message selections, pgp encryption, ispell support, and can read from both a local spool or from a remote NNTP server.
sonews is a RCF 3977 compliant NNTP Usenet Server. It is written in Java and uses CouchDB or a relation database management system (RDBMS) as backend (currently PostgreSQL and MySQL). sonews is highly multithreaded and uses Java NIO asynchronous sockets to handle thousands of concurrent connections.