Source : https://github.com/morpheus65535/bazarr
Bazarr is a companion application to Sonarr and Radarr. It manages and downloads subtitles based on your requirements. You define your preferences by TV show or movies and Bazarr takes care of everything for you.
Be aware that Bazarr doesn't scan disk to detect series and movies: It only takes care of the series and movies that are indexed in Sonarr and Radarr.
Major Features Include:
Support for major platforms: Windows, Linux, macOS, Raspberry Pi, etc.
Automatically add new series and episodes from Sonarr
Automatically add new movies and episodes from Radarr
Series or movies based configuration for subtitles languages
Scan your existing library for internal and external subtitles and download any missing
Keep history of what was downloaded from where and when
Manual search so you can download subtitles on demand
Ability to delete external subtitles from disk
Currently support 184 subtitles languages
And a beautiful UI based on Sonarr
Supported subtitles providers: