SubDownloader - SubDownloader - Fast and Easy Subtitle Downloader
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Addic7ed - Subtitles for TV shows and movies.
GrammarChecker.net - Grammar Checker is an online spell check tool. It effectively works on English sentence correction, Punctuation mistakes of 28 other different languages.
Caption - Open-source captioning tool to help find the right subtitles.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.