Silk Icons : “Silk” is a smooth, free icon set, containing over 700 16-by-16 pixel icons in strokably-soft PNG format.
Favicon Generator : Upload an image (GIF, JPEG or PNG) and convert it to a Windows favicon (.ico)
DryIcons : Search through more than 6700 vectors and icons designed by DryIcons!
Hand crafted, scalable vector icons for designers and developers.
This pack comes with 264 custom icons in SVG, AI, ESP, PSD, CSH and PNG format.
All the icons are royalty free for personal and commercial use.