Grammarly - Clear, effective, mistake-free writing everywhere you type.
Invision - Prototyping and collaboration for design teams
Typely - A sensitive, unobtrusive and reliable tool for any writer, newspaper editor, teacher, blogger or student STA
Proto.io - Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.
editorr - Get instant writing help from real editors.
Zeplin - Collaboration app for UI designers & frontend developers