Top and popular websites for free icons

1. Flaticon (https://www.flaticon.com/)
2. Icons8 (https://icons8.com/)
3. Font Awesome (https://fontawesome.com/)
4. Material Design Icons (https://material.io/resources/icons/)
5. Iconfinder (https://www.iconfinder.com/)
6. Freeicons.io (https://freeicons.io/)
7. Feather Icons (https://feathericons.com/)
8. Streamline Icons (https://streamlineicons.com/)
9. The Noun Project (https://thenounproject.com/)
10. IcoMoon (https://icomoon.io/)

These websites offer a wide range of icons that can be used for various purposes such as web design, mobile app development, and graphic design. You can search and download icons in various formats such as SVG, PNG, and ICO.