silhoutteAC - More than 47,000 vector silhouettes for free
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
IconBros - Free and continuously growing high quality icons
IconStore - Free icon packs by first-class designers
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Iconjar - Store all your icons in one place, just a click away