Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Endless Icons - A collection of free flat icons and creative stuff
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
Zwicon - A simple, carefully designed collection of icons
Font Awesome - Font Awesome makes it easy to add vector icons and social logos to your website. And version 5 is redesigned and built from the ground up!