Here you will find more than 50 high quality icon sets for the designers. You can download any icon free of cost without having to pay for it. All the icon sets are in different categories. Download as much as you desire. If you appreciate and like this post so please do not forget to leave your valuable comment. Thanks
Note: you can use all free icons as per their license policy.
Free Icons: Function Icon Set, 128 Completely Free Icons
micrOS icon pack