IconStore - Free icon packs by first-class designers
1000 Detailed Creative Icons - Carefully designed icons with tons of fine details
Feather Icons - Simply beautiful open source icons
Iconjar - Store all your icons in one place, just a click away
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
TW Fonts - TW Fonts is vectorized font icon library for use with your website or app.