Google Fonts - Making the web more beautiful, fast, and open through great typography
Typetura - Fluid typography for a fluid web
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.
Archetype - Create beautiful web typography designs, in the browser
Font Generator - Tons of font ideas in one click
Discover.typography - Discover great fonts through themes.