iOS 11 icons: Glyphs - Most demanded iOS 11 icons for free by Icons8
My Icons - Flat icons manager and web icon font builder
IconStore - Free icon packs by first-class designers
Iconoir - A diverse and open-source library with 900+ icons
Streamline icons - The world’s largest icon pack library - 100k icons and illustrations.
Pixel Icons - 6,500 unique icons designed for perfection 🚀