IconBros - Free and continuously growing high quality icons
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Icons8 - Free app for Mac & Windows already containing 39,800 icons. Allows to search and import icons…
BrandSearch - Search assets and colors for a variety of different brands