Edge Reflow application is used by web designers to create a native web surface with CSS design and layout features in a familiar and intuitive way. Edge Reflow helps designers to create resizable layouts that simulate the look and feel of both desktop and mobile devices; control media query breakpoints in design for custom device sizes, add typography to their projects using the integrated Edge Web Fonts, and preview their work on desktops as well as mobile devices using the integrated Edge Inspect plug-in. You can extract CSS code and hand off to developers with confidence that your design vision will remain uncompromised throughout development.
Source: http://designmodo.com/edge-reflow-cc/#ixzz2Z0l3DYR3