Metrize Icons

http://www.alessioatzeni.com/metrize-icons/

IcoMoon - Free

http://icomoon.io/app/#/select

Font Awesome

http://fortawesome.github.io/Font-Awesome/

flaticon

http://www.flaticon.com

XEICON

http://xpressengine.github.io/XEIcon/index.html

Material Icons

• https://dribbble.com/shots/1697054--SVG-Sketch-Material-Icons-Pack
• https://material.io/tools/icons