I have small list of free and open source icon libraries that looks nice as time time of writing (October 2022).
- https://heroicons.com/
- https://www.streamlinehq.com/
- https://react-icons.github.io/react-icons/
- https://www.figma.com/community/file/1114001199549197320
Oldies but still goodies
More icons here https://appydev.co/icons