SABnzbd is an open-source binary Usenet downloader for Windows, Linux and Mac. It's written in python, and presents itself to the world through a web interface. SABnzbd is one of the fastest, most efficient and fully-featured Usenet downloaders around, and the best part is, it's totally free.

Although the web interface is very usable, and reasonably user-friendly, it does lack the convenience of having an icon readily accessible from your system tray.

SABnzbd UI addresses this, and provides a 'standard' user interface to access the major functionality of SABnzbd.
SABnzbd UI can access SABnzbd servers running either on your local machine, on your local network, or (in the future) on the internet, providing you with a quick and easy overview of your SABnzbd server, without having to load a web browser.

• Current Features:
  •  Simple, intuitive UI
  • Minimize to tray
  • Client-side 'add job' functionality - by PostID or .nzb file
  • Extensible (via source code), easy-to-understand, events-based code
  • Other cool things
    
• Future Features:
  • Completion notifications ('toast')
  • UI Theme support
  • Plug-ins
  • Support for password-protected SABnzbd servers

You can view the online documentation here, or see the Documentation folder in the source code and binary packages.