Podnapisi (Slovenian for "subtitles") is a robust alternative with an excellent advanced search engine. You can filter by hearing impaired, foreign parts only, or exact frame rate (FPS).
While the content itself (the movie) is often protected by copyright, the subtitle files are considered a "derivative work." In most jurisdictions, downloading subtitles is a legal gray area. English Subtitles Free Download For Movies
For those who want instant access without creating an account, Subs4Free is a fast solution. It focuses on clean, well-formatted English subtitles. foreign parts only