IDesk provides icons on an X11 desktop. Its features include transparency, configurable actions to run shell commands, PNG, SVG (in old versions), GIF image support, and XFT anti-aliased fonts. Other features include Imlib2 support (Imlib is deprecated), pseudo-transparency, the ability to only show captions on mouseover, tooltip on mouseover, startup notification, and more.
OpenIcons is a set of SVG icons intended to be used on the Web. All the icons are vector-based and made using InkScape. The icons can easily be converted from SVG to pretty much any common graphics format. Since the icons are meant to be used primarily on the Web, the default distribution of the icons includes PNG copies of all icons scaled to the following sizes: 16x16, 32x32, 64x64, and 128x128 pixels.
Toolbar Icons is a collection of free toolbar icons. All icons are available as (Inkscape) SVG files. OMake build scripts that automatically generate PNG files of basically any size (using Inkscape) are included. PNG files in a few default sizes (16 x 16, 24 x 24, 32 x 32, and 256 x 256) are prepared in .tar.gz archives.
3D Business Icons is a collection of business-related icons for Web sites and software projects. it contains images in 16x16, 20x20, 24x24, 32x32, 48x48, 128x128, 256x256, and 512x512 pixel sizes. All of the images are hand-crafted by professional graphic designers and present smooth, well-rounded edges. The file formats provided are ICO, BMP, and PNG with a transparent background.
SuperStamps is a collection of 654 beautiful, professional looking PNG images and icons. They come in many different colors with a modern, glassy look. A free trial includes 25 high quality images. The collection includes images suitable for technical reports, presentations, Web sites, blogs, Snagit stamps, tutorials, videos, and much more.
Large Business Icons is a collection of royalty-free icons that includes a wide variety of images related to business and banking. It includes icons representing various financial operations, documents, and people. Each image is provided in 6 resolutions (16x16, 24x24, 32x32, 48x48, 256x256, and 512x512 pixels) and 4 image formats (GIF, PNG, ICO, and BMP). You can use these icons for desktop and online applications.
Design iPhone-ready apps with Medical Icons for iPad and iPhone. This collection of health-related icons includes 250 unique images for the iOS developer. They are supplied in PNG and Adobe PSD formats. With this collection, you can build mobile apps for the health care system, including drug prescription, patient registration, and treatment control apps.