IconStore - Free icon packs by first-class designers
MonoLisa - font follows function
Feather Icons - Simply beautiful open source icons
Mononoki Typeface - Font for programming and code review
Iconjar - Store all your icons in one place, just a click away
Android Icons - Androidicons is a professional, handcrafted icon set with 250 icons in 14 different colors and 5 sizes, including an icon font and all sources.