Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
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!
Fonts4Free - Archive of freely downloadable fonts for Windows and Mac OS.
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
Befonts - You can download the best fonts, free fonts for personal or commercial use.