Here we go with some Free Icon Download Websites For Graphic Designers
https://www.iconfinder.com/search/?q=download: This allows you to filter the icons by license type and file type. The downloading icon in svg, psd and png formats with different sizes makes this site stand top of the list. Have a look at the screenshot below for better understanding.
http://www.free-icons-download.net/: Search from 100000+ icons (including vector icons) arranged in more than 50 categories. Personally, I feel this is the site where every designer will find all the stuff for their works.
https://icons8.com/: icons8 gives you 34,000 free flat icons for your works. Download icons from any of the four optimized resolutions from tiny 16×16 to highly detailed 80×80.
http://www.flaticon.com/: Download free icons from the largest database of 197,904 vector icons grouped in 3,250 packs. The handy search box lets you download colorful icons in PNG, SVG, EPS, PSD and BASE 64
http://www.iconarchive.com/: Download colorful commercial free icons for your projects from 46 categories. You are able to search by color, date, license type and popularity of the icons.
http://www.freepik.com/: Filter and download the required icons from 98,474 free icons. Use them for your personal and commercial works by downloading in PNG, EPS and SVG
http://dryicons.com/: dryicons on the other hand gives you free icons from 5000 icons in 77 icon sets. In addition, you can download free vector graphics, banners, and backgrounds and many other design elements for free.
http://findicons.com/: This site allows you to download free colored icons in ICO, PNG, Multi-res ICO formats along with free vectors and you can upload your works.
http://www.iconspedia.com/: iconspedia, like findicons, offers you free icon packs with multiple categories including social media packs, brand icons etc. Submit your icons for others to download.
http://www.freeiconsdownload.com/: Get high quality royal free icons and icon sets for you projects here. Download gif icons from the gallery of boring static categories.
http://www.logocraft.com/: This is gives you free icon sets based on the category you select from the given list. You can also design a free here in less than a minute.
http://www.1001freedownloads.com/: This site not only gives you icons, but also allows you to download free vectors, fonts, wallpapers, textures, patterns and many more from its huge collection.