hellanzb is a Python application designed for *nix environments that retrieves nzb files and fully processes them. The goal being to make getting files from Usenet (e.g.: Giganews Newsgroups) as hands-free as possible.

fully installed, all thats required is moving an nzb file to the queue directory. The rest; fetching, par-checking, un-raring, etc. is taken care of by hellanzb.

Current Stable :- 0.12
Project Home Page :- http://www.hellanzb.com/trac/

Prerequisites
twisted
You will want the command line (CLI) versions of the following
rar (or unrar) - rar extraction tool
par2cmdline - par/par2 Parity checker
Optional
mac -- Monkey Audio decoding
flac -- Free Lossless Audio Codec decoding

Install Hellanzb in Ubuntu

More Here.