Hemingway - Hemingway App makes your writing bold and clear.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
TheRightMargin - TheRightMargin is a smart writing tool.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.