Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Space Icons - 77 hand-drawn space icons in multiple graphic versions
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
IconStore - Free icon packs by first-class designers
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
Iconjar - Store all your icons in one place, just a click away