Responsive design is the new order when it comes to UI design. A responsive design makes sure that a website or UI design turn out awesome on any device, whether it’s smartphone, laptop or tablet, and grab the attention of everyone. We have a flat responsive showcase mockup here for you. It’s a mockup of different devices on which you can easily place your design via the smart layers. It is a useful way to show your client how your layout will appear on different screens with various sizes. You can also use it to present your UI designs in your personal portfolio. The flat style will give your presentation a further modern look.
Thanks to Pixeden for this free resource. They host lots of free and premium design resources on their website. Check them out.