Material Icons Library is a free set including 1000+ icons recently released by the design team at Pixsellz. All icons…
200 Foodie Pack - a set of free food icons from Smashingmagazine. The set has 200 items from fruits to drinks or restaurant/kitchen equipment.
IconBeast Lite is a high-quality and free iPhone icons set that iOS developers will probably like so much.
Icons DB, a free and growing set of flat icons - includes 1800+ items in multiple formats (ICO, PNG, JPG, GIF) and 8 sizes from 16*16px to 512*512px.
Simple Icons is a set of 96 free social icons that cover almost all of the well-known social services (Twitter, Facebook, Instagram, Google+ and much more).
Everybody loves high-quality and free icons with a massive number of items and Gemicon is an exciting set that will surely get your love.