Classy icons crafted according to Microsoft guidelines. Available in PNG and SVG. Free for a link
Feather Icons - Simply beautiful open source icons
Personalization API - Instantly pull company branding data to use in your projects
IconStore - Free icon packs by first-class designers
nabbyl - Get color palettes from your favorite albums.
Flat Icons - 20,000 unique, customizable icons with free lifetime updates
Pinreel - Pinreel is lightweight application software that is used to create fun and interesting animation videos by using pro-level templates.