Checkout Webflow.com (I'm one of the co-founders and designers). A lot of people compare Webflow to Macaw, but the approach each takes is different. Macaw wants to be the tool designers use to show their website's intent to the developer - kinda like handing off a Photoshop file but with more native responsive website interaction. Webflow wants to be the tool designers use to build their whole website from start to production without relying on a developer. Macaw generates layout code for while Webflow lets you decide what kind of CSS is best to create your responsive layout. Try them both!