Leafnode

Leafnode is a store-and-forward NNTP (or Usenet) 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^[4] in 1995 while he was working at Trolltech, it is currently maintained by Matthias Andree and Ralf Wildenhues.

Leafnode

Original author(s)	Arnt Gulbrandsen
Developer(s)	Matthias Andree
Initial release	1995 (1995)
Stable release	1.12.0 / May 26, 2022; 2 years ago (2022-05-26)[1]
Written in	C
Operating system	Unix-like
Available in	English
Type	Usenet server
License	LGPLv2,[2] ISC[3]
Website	www.leafnode.org

The term leaf node can also be used to describe a node on a binary tree (or any other sort of tree that has nodes) which has no sub-nodes.