https://css.gg/
modern cool and useful. CSS icons 700+ icons. In advance use you can also animate them.

Tabler
https://tabler-icons.io/
1978+ icons

Fontello
https://fontello.com/

Flaticon
https://www.flaticon.com/

icons8
https://icons8.com/icons/

IconArchive
https://iconarchive.com/

bootstrapious.com/p/icon-fonts