14. Font Awesome Icons
Font Awesome Icons are one of the oldest and most popular icon sets in the world, used by millions of designers, developers, and content creators. Originally developed in 2012, it was designed for Bootstrap but evolved into its own icon set.
You've probably heard of Font Awesome before, and if you haven't, you've definitely seen these icons on the web. As of 2020, Font Awesome was used by 38% of sites that use third-party font scripts.
Their free library includes a huge 2,009 free vector icons across multiple styles. They also have a paid premium plan that includes 16,000+ icons with faster loading and technical support.