Icons8 is a collection of 13,800 icons+icon software that saves 7 minutes of work. For each icon!
Icons8 started developing flat color icons in March, 2015 (see 300+ icons freebie) and have 1,800 of them now, ready to be shared with Free Web Resources community.
Normally only 100×100 px PNG icons are free, but since you guys are pretty and smart as hell, you can get 200×200 px PNGs by using this secret link 
All of these 1,800 cuties are yours, but please don’t forget to set a link to Icons8.
A brief style guide for Icons8 flat color icons:
- Material colors
- Filled objects
- No use of the negative space
Icons8 even has a special tool for comparing the style of Color icons with iOS8, Windows 8 + 10 and Android Lollipop + Kitkat icons. Try it; it’s fun:
This collection includes business and ecommerce icons, photo and video icons, arrows, files, data and many more. When you start downloading them, please note, that you can create and download collections right from the Icons8 Web App. For example, you can create a collection of:
- Icons for a specific project;
- Icons that you use frequently;
- If you have SVGs (try getting them from 300+ free color icons), you can generate fonts. Although it doesn’t have some of the advanced features of Icomoon (Icomoon is fantastic!), it’s still pretty good and useful.
The bad news here is that icons are stored in your browser’s local storage. This means you can’t use the collection on another computer. There’s a geeky way though; you’ll have to copy your local storage file. There are some great instructions for Angry Birds: http://www.angrybirdsnest.com/how-to-backup-and-sync-angry-birds-chrome-progress/. The only difference is that the file is called http_icons8.com_0.localstorage
Also, Icons8 doesn’t limit PNG icons to the predefined icon sizes. Instead, one can generate any icon size within 200×200 px. Given that, you shouldn’t care about the icon sizes yet. However, icons are pixel perfect for the standard sizes for a given icon: 25×25 px, 32×32 px, 50×50 px, 64×64 px and 512×512 px (the latter is for a fee).
Again, the icons are free for personal and commercial use, but the license requires linking to authors. Why to link? Maybe you find this story convincing:
All in all, it’s about Creative Commons Attribution-NoDerivs 3.0 Unported.