NZBDrone vNext is currently under development to be faster, smarter and work on all major platforms (Windows, Linux, OSX).
There ARE severe bugs in it and at any given time it may not work at all.
NZBDrone
NZBDrone is a PVR for newsgroup users written in .NET 4.0. It can monitor multiple RSS feeds for new episodes of your favourite shows and will grab, sorts and renames them. It can also be configured to automatically upgrade the quality of files already downloaded if a better quality format becomes available.
Major Features Include:
Automatically detects new episodes
can scan your existing library and then download any old seasons that are missing
can watch for better versions and upgrade your existing episodes. eg. from DVD to Blu-Ray
fully configurable episode renaming
full integration with SABNzbd
full integration with XBMC (notification, library update, metadata)
full support for specials and multi-episode releases
Configuring Development Enviroment:
Requirements
Visual Studio 2012 (Express Edition might work but not tested.)