Flaticon - A database of free vector icons.
Google Fonts - Making the web more beautiful, fast, and open through great typography
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!
FontFace ninja - A browser extension to identify and try fonts on any website
IconArchive - Search through more than 735,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.
FontJoy - Get smart font pairings in one click