SABnzbd

SABnzbd is a free and Open Source web-based binary newsreader, with support for the popular nzb file format. It greatly simplifies the process of downloading from Usenet, thanks to a friendly web-based user interface and advanced built-in post-processing options including the ability to automatically verify, repair, extract and clean up downloaded posts. It runs anywhere, comes in over a dozen languages, and integrates with a host of tools, apps and services that help automate the download process.