What are some alternatives?
When comparing Flaticon and The Noun Project, 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!
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..
IcoMoon - IcoMoon is an icon management tool that is build to provide iconography.
Fontello - Tool to build custom fonts with icons.
IconArchive - Search through more than 735,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.