Grammarly - Clear, effective, mistake-free writing everywhere you type.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
iTunes - Media player, media library, Internet radio broadcaster, and iPhone device management application
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
tOndO keyboard - A fast, accurate and easy to learn alternative input method.
Typosaurus - Quickly check your website for spelling errors