URD is a program to identify, locate, and download binaries from usenet (newsgroups) through a web interface. It utilizes the spotnet protocol [Read Spotnet, Spotweb]. Similar to the spotweb client in nature for finding and identifying NZBs, URD additionally includes its own native download and unpacking engine, making it different from Spotweb.
While some other programs offer similar services (e.g. Ninan, Sabnzbd), URD doesn't need external NZB files to function. URD lets you subscribe to newsgroups, and will then automatically analyse those articles to form downloadable 'sets', consisting of all the files belonging to a specific upload. These sets are displayed, and through point and click you can be downloading a binary in no time. ... More Info »
That isn't to say that NZB files are unsupported. URD allows both exporting of NZB files (from a set, for example) and importing.