Previewed is a mockup generator, which is used by devs & designers to create beautiful promotional graphics for your app. Browse a variety of templates, pick one, customize it in a few clicks & download your pixel perfect design.
Mockuptime is the ultimate collection of beautiful, realistic PSD mockups to showcase your work. Available for free, just how you like it.
shotsnapp is a simple tool to quickly create beautiful device mockup presentation for your app and website design.