UserInterfaceIcons is a site that offers free icons for your need in web or software appplications. All icons on the website are free.
The site currently offers more than 500 high quality icons, all free in a single download file. Icons comes in .PNG format, with these following sizes 80 by 80 pixels, 48 by 48 pixels, 32 by 32 pixels, and 24 by 24 pixels. Download them from here.
