Coda (Acquired by Grammarly)

Coda blends the flexibility of a document, the power of a spreadsheet, and the utility of applications into a single new canvas, enabling anyone to make a doc as powerful as an app. Coda is something entirely new, that looks and feels familiar. Makers start with a blank canvas and a familiar blinking cursor, but can use a new set of building blocks like tables that act like databases, or buttons that take action to create their own unique solutions.