As a developer, you will surely have the need to showcase your designs possibly to your clients. This awesome perspective app screen mockup allows you to create amazing presentations for your app and UI presentations. All you have to do is add your designs via Photoshop smart layers and you are good to go with the PSD file.
Thanks to Pixeden for this stunning mockup. They made it available for free. If you are in love with this particular mockup, check out other resources on their website.