Leafnode
Leafnode is a store-and-forward NNTP proxy server designed for small sites with just a few active newsgroups, but very easy to set up and maintain, when compared to INN. Originally created by Arnt Gulbrandsen in 1995 while he was working at Trolltech, it is currently maintained by Matthias Andree and Ralf Wildenhues.
The term leaf node can also be used to describe a node on a binary tree which has no sub-nodes.