Grammarly - Clear, effective, mistake-free writing everywhere you type.
Hemingway - Hemingway App makes your writing bold and clear.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
exegesis - A writing app for disorganized, creative, nonlinear thinking
Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.
Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.