Forget about spending hours learning how to use Photoshop. Smartmockups enables you to create stunning high-resolution mockups right inside your browser within one interface across multiple devices.
The simplest way to create device mockups.
WebGradients is a free collection of 180 linear gradients that you can use as content backdrops in any part of your website.
Ad mockups provides a free tool to create mockups of ads on the fly.