Clarity is a complete web application layout & theme toolkit available on Themeforest. This web app template can be used for backend admin templates, and is flexible enough for multiple types of webapps: Analytics Apps, Project Management Apps, Social Apps and more.
The design is fully responsive and accommodates wide desktops, all the way down to smartphones (plus everything in between).
It features a unique layout with collapsable and resizable sidebars. The interface is all CSS3 with web font icons so that it loads quickly and looks great on retina displays.
Try out the preview here: http://themeforest.net/item/clarity-responsive-web-app-admin-template/full_screen_preview/2828363