Flaticon - A database of free vector 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!
1000 Detailed Creative Icons - Carefully designed icons with tons of fine details
IconArchive - Search through more than 735,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.
Icons Mind - The Biggest iOS 8, iOS 7 & Android Icons Pack
Iconfinder - Iconfinder is the leading search engine and market place for vector icons in SVG, PNG, CSH and AI format..