SubDownloader - SubDownloader - Fast and Easy Subtitle Downloader
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Addic7ed - Subtitles for TV shows and movies.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Caption - Open-source captioning tool to help find the right subtitles.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.