Google Material Symbols and Icons

https://fonts.google.com/icons img.png

GitHub Octicons

https://primer.style/octicons/ img.png

Sargam Icons

https://sargamicons.com/ img_3.png

Thousands of free icons

flaticon

https://www.flaticon.com/ img_1.png

ICONFINDER

https://www.iconfinder.com/ img_2.png

iconfont

https://www.iconfont.cn/ img_3.png

open-iconic