Material Icons Library - Free collection of 1000+ icons for design
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Eva Icons - 480 Open Source icons for common actions & items
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Vivid JS - A highly customizable, open source SVG icons library
Flat Icons - 20,000 unique, customizable icons with free lifetime updates