IconStore - Free icon packs by first-class designers
Zwicon - A simple, carefully designed collection of icons
omg-img - Insert icons directly into your HTML just by coding
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Mosaic - Mosaic provides brands with solutions to store and categorize their digital graphic and photography files for quick and easy retrieval.
Vivid JS - A highly customizable, open source SVG icons library