What are some alternatives?
When comparing sourceforge.net Kwooty and NewsBin, you can also consider the following products
GetNZB - GetNZB is a free Newsreader software with integrated NNTP access for downloading files from Usenet.
GrabIt - GrabIt is a free application that enables you to easily find and download content from Usenet news...
Usenet.net - Usenet.net has been a trusted Usenet provider since 2004 offering a choice of unlimited Usenet...
SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.
HelloNzb - HelloNzb - The Binary Usenet Tool
NZBGet - The most efficient usenet downloader.