What are some alternatives?
When comparing Flaticon and Fontspace, you can also consider the following products
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!
Font Squirrel - Font Squirrel scours the internet in search of FREE, highest-quality, designer-friendly, commercial-use fonts and presents them for easy downloading. We don't have the most, but we do have the best.
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.
Fonts.com - Fonts.com provides the biggest and best selection of high quality desktop and web fonts. Try, buy and download classics like Helvetica, Univers, Frutiger, Trade Gothic and Avenir along with popular new fonts like Soho and Neo. Find your type!