stdin2news is a simple script that posts imput from STDIN to a news server. It is easily configurable, doesn't require any external programs, and can be used in batch jobs. Unlike rnews it does not require a msgid to be provided, as it presumes it will be generated by the news server.
nntpfs is a FUSE module for mounting the data offered by NNTP servers. Read-only access to the servers is provided. The Network News Transfer Protocol or NNTP is an Internet application protocol for the distribution of news and occasionally binary files. Usenet represents the most common usage of the NNTP protocol. The Filesystem in Userspace (FUSE) interface allows user application code to create its own filesystems and publish them using kernel support.