What are some alternatives?
When comparing Flaticon and Font Awesome, you can also consider the following products
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
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.
Iconfinder - Iconfinder is the leading search engine and market place for vector icons in SVG, PNG, CSH and AI format..
Fontello - Tool to build custom fonts with icons.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language