Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
IconStore - Free icon packs by first-class designers
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
omg-img - Insert icons directly into your HTML just by coding
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
Mosaic - Mosaic provides brands with solutions to store and categorize their digital graphic and photography files for quick and easy retrieval.