Sonarr is a PVR for Usenet and BitTorrent users. It can monitor multiple RSS feeds for new episodes of your favorite shows and will grab, sort and rename them. It can also be configured to automatically upgrade the quality of files already downloaded when a better quality format becomes available.
Download/Installation
FAQ
Wiki
v4 Beta API Documentation
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Note: GitHub Issues are for Bugs and Feature Requests Only
Forums
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GitHub - Bugs and Feature Requests Only
IRC
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Support for major platforms: Windows, Linux, macOS, Raspberry Pi, etc.
Automatically detects new episodes
Can scan your existing library and download any missing episodes
Can watch for better quality of the episodes you already have and do an automatic upgrade. eg. from DVD to Blu-Ray
Automatic failed download handling will try another release if one fails
Manual search so you can pick any release or to see why a release was not downloaded automatically
Fully configurable episode renaming
Full integration with SABnzbd and NZBGet
Full integration with Kodi, Plex (notification, library update, metadata)
Full support for specials and multi-episode releases
And a beautiful UI