OpenSubtitles.org - OpenSubtitles.org was developed for easy downloading and uploading subtitles for movies.

Readarr - Readarr is a ebook collection manager for Usenet and BitTorrent users. It can monitor multiple RSS feeds for new books from your favorite authors and will interface with clients and indexers to grab, sort, and rename them.

SubDownloader - SubDownloader - Fast and Easy Subtitle Downloader

LazyLibrarian - LazyLibrarian is a program to follow authors and grab metadata for all your digital reading needs.

SubiT - With SubiT, you can download subtitles to your favorite movies and serieses, with a simple click.

Bazarr - Bazarr is a companion application to Sonarr and Radarr that manages and downloads subtitles based on your requirements.