Icons8 app allows to search icons and insert directly into Photoshop, Expression or anything. Contains 2800+ free icons for developers and designers. Icons are in PNG format in multiple sizes from 25x25px to 512x512 px, in iOS 7 and Windows 8 styles. The application resides in status bar and allows to search by tags, drag to Xcode, Photoshop or anything. Vector icons are not included into the application and available for a fee.