Wp Customizer Icon (wp-customizer-icon) free WordPress plugin

Wp Customizer Icon plugin is very easy to use. It contains 3696 material design icons. User can add extra icon classs to the icon library from there theme.
There is an filter hook named WPCI_customizer_icons by which user can marge extra icons class. Icon control name is WPCI_Customize_Icon_Control.
See the Github project repository.