Material Icons Library - Free collection of 1000+ icons for design
IconStore - Free icon packs by first-class designers
Eva Icons - 480 Open Source icons for common actions & items
omg-img - Insert icons directly into your HTML just by coding
Iconjar - Store all your icons in one place, just a click away
Mosaic - Mosaic provides brands with solutions to store and categorize their digital graphic and photography files for quick and easy retrieval.