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!
FontJoy - Get smart font pairings in one click
Typewolf - Typewolf helps designers choose the perfect font combination for their next design project—features web fonts in the wild, font recommendations and learning resources.
FontFace ninja - A browser extension to identify and try fonts on any website
Font Generator - Tons of font ideas in one click