What are some alternatives?
Flaticon - A database of free vector icons.
IconStore - Free icon packs by first-class designers
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
Nova - The essential design material icons pack
Google Fonts - Making the web more beautiful, fast, and open through great typography
IconPharm - IconPharm is a library of open source icons with recoloring and resizing tools.