Noun Project is a huge creator marketplace of roughly 10 million icons and stock photos contributed by independent designers, not a single studio's cohesive set.
With millions of icons from thousands of independent creators, it's the place to find a very specific or unusual concept that a smaller curated set simply won't have drawn.
Best when you need to search broadly for one particular icon concept rather than match a single visual style across an entire interface.
Free downloads require attribution to the creator; a paid Pro subscription removes that requirement and opens up higher-resolution files: worth checking per icon since style and quality vary by contributor.
Over 2 million curated icons, contributed by a global community.
