nget was a command-line Usenet client program. The software appears to have been abandoned in 2006. nget supported PAR and yEnc, but not RAR or NZB. If you want a Usenet client that supports all of the current standards, then download our Super NZB program.
You can still download nget, and its C++ source code at SourceForge. Don’t even think about it if you are a newbie.