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!
Adobe Edge Web Fonts - Edge Web Fonts is a free service that provides access to a large library of fonts for your web site.
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Fonts For Web - Free web fonts sharing website. Wordpress plugin available!
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
Fontello - Tool to build custom fonts with icons.