Primera is a GUI kit for creating iOS applications. A free PSD containing a great variety of elements (icons, buttons, sliders, etc.).
Dark/green UI kit containing buttons, switches, toggles, search field, checkboxes, pagination buttons. Free PSD designed by Blackjamun.
Dark/green UI kit free PSD
Dark UI kit containing buttons, checkboxes, toggles, dropdowns, search fields, text fileds, sliders. Free PSD designed by Vinny Singh.
Dark/orange UI kit free PSD
This Blue UI (user interface) kit includes everything from checkboxes, radio buttons, and toolbars, to search boxes and tooltips.
Blue UI Kit free PSD
A complete UI kit containing iOS6 iTunes and App Store. There is the alpha version of the vector & Retina-sized. Free PSD.