A Newsreaders is a computerprogram that is used to read/download articles, movies, games and music from usenet, for example there are some files you like to have and are posted in the alt.binaries.boneless then its possible with a newsreader to download the files you need. Some of the Usenet Providers (Usenext and Firstload) have got a newsserver where you can download these files at full speed. ISPs often don't have a newsreader and so there are a few to choose from, as a lot of people are using their ISP to download:
Usenet Newsreaders for Windows
Newsleecher, Grabit, Alt.binz, Newsbin Pro, Forte Agent, Binary Boy, Newsrover, SABnzbd, Newsreactor, Ultraleecher, Usenet Explorer, Tamava, Ozum and Xnews.
Usenet Newsreaders for Linux
Hellanzb, Pan, BNR2, Klibido, Ninan, Tamava and Urdland.
Newsreaders for the macintosh
Unison, Hogwasher, Nzbdrop, OSXnews and igrab news .