Fire Toolbar Icons is just the thing to spice up your interface and make it look much more attractive and stylish. The set of icons has a bright color palette and is really wonderfully-crafted. Icons are available in different color depth and sizes.
Downloads: 20719 - Demo - Download Now

Vista Network Icon Library is a collection of network-related windows icons. The collection is distributed as BMP, PNG, GIF, ICO files. Each icon has 16x16, 24x24, 32x32, 48x48 and 256x256 pixel versions, as well as variants with and without shadows.
Downloads: 48421 - Demo - Download Now

Here is the actual Tab Bar iOS Icons collection, which will help each iPhone and iPad application developer get his GUI look better. The icons from this icon collection can be used in navigation, tab bars and toolbars of iOS applications.
Downloads: 17911 - Shareware - Download Now

A comprehensive collection of interface icons for modern applications and websites. The set covers a wide range of popular topics, while each of its 167 icons comes in a variety of formats (PNG, GIF, BMP, ICO) and resolutions.
Downloads: 35686 - Shareware - Download Now

If you want your application to look professional and yet be user-friendly and eye-catching, don't look too far. Green Medical Icons will give you the best of two worlds. This set is just what the doctor ordered for your medicine-related projects!
Downloads: 25799 - Demo - Download Now