SubRip - SubRip is a software program for Windows which "rips" (extracts) subtitles and their...
Amara - Amara
Kainote - Kainote subtitles editor and player
Poedit - Poedit translations editor. The best way to translate apps and sites.
3PlayMedia - 3PlayMedia provides closed captioning, transcription, and subtitling solutions.
translated.by - It's called collaborative translation.