Grammarly - Clear, effective, mistake-free writing everywhere you type.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Invision - Prototyping and collaboration for design teams
Editsaurus - Highlights potential pitfalls in your writing to encourage good habits.
Sketch - Professional digital design for Mac.