The Noun Project is described as 'Over 2 Million curated icons, created by a global community' and is a Icon Library in the online services category. There are more than 50 alternatives to The Noun Project, not only websites but also apps for a variety of platforms, including Self-Hosted, Windows, Figma and Mac apps. The best The Noun Project alternative is Flat-icons. It's not free, so if you're looking for a free alternative, you could try Font Awesome or Iconfinder. Other great sites and apps similar to The Noun Project are Icons8, Flaticon, IconArchive and IcoMoon.