Here’s a free PSD containing the full concept of a mail app user interface. Designed by Aleksandar Djuric.
User interface of Microsoft Surface RT device. Free PSD and AI vector files designed by Erik K. They are really well made!
Microsoft Surface RT UI PSD
UI kit on leather texture. Free PSD containing three buttons, one app icon, zip chain, and some UI elements that you can freely use.
Leather UI kit PSD
Today on 365psd there’s a free PSD containing a basic transparent UI kit with buttons, toggles, alert messages and a media controller.
Transparent UI kit PSD
Metrostyle Web UI is a modern interface that adapts to any web using standard components and its 5 different color combinations. Free PSD.
Metrostyle Web UI kit free PSD
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
Free PSD files containing new Twitter GUI. There are 2 versions: one for standard twitter profiles and the new twitter enhanced profile page.
New Twitter GUI 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.