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 movie and Bazarr takes care of every...
Subtitles Automation
autosub
[NO LONGER MAINTAINED] Command-line utility for auto-generating subtitles for any video file - agermanidis/autosub
nzb-subliminal
Fetches subtitles for the videos it's provided. It can be easily integrated into NZBGet and SABnzbd too. - caronc/nzb-subliminal
subsync
Automagically synchronize subtitles with video
vlsub
VLC extension to download subtitles from opensubtitles.org - exebetche/vlsub