Memo.ai - Simple and elegant notes app on your Mac
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Better Notes - Simple notes app that ties notes together with #hashtags
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.