Flat-icons is described as 'Download the most beautiful flat icon sets on the web. Thousands of flat and colored icons in different styles and themes. One cool feature is that you can suggest new themes to the design team with a big chance the suggested theme is created next'. There are more than 10 alternatives to Flat-icons, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Font Awesome, which is both free and Open Source. Other great sites and apps similar to Flat-icons are Flaticon (Freemium), Iconfinder (Free), Icons8 (Freemium) and IconArchive (Free).
IconArchive is a professional tag and color filter based icon search engine with more than 290,000 icons for web developers, end users and graphic artists. You can collect, organize & share your favorite icons here with ease.
Creating, Sharing and Celebrating the World's Visual Language The Noun Project is building a global visual language that everyone can understand. We want to enable our users to visually communicate anything to anyone.