Caption - Open-source captioning tool to help find the right subtitles.
SubDownloader - SubDownloader - Fast and Easy Subtitle Downloader
Subtly - Learn English with smart subtitles on movies and TV shows
Open Subtitles FlixTools - Download perfectly matched subtitles for your movies and TV series, edit meta-data and convert...
Bazarr - Bazarr is a companion application to Sonarr and Radarr that manages and downloads subtitles based on your requirements.
Addic7ed - Subtitles for TV shows and movies.