Colorful Flat Icons
12 free flat icons as a sample pack, you can use for your project for free, linkback is very appreciated.
Food Icons Set
42 Long shadow social
42 long shadow social icons provided in many formats and sizes. It also includes a Photoshop PSD for changing the sizes and colors.
Long shadow social icons
Some free vector shaped long shadow social icons provided in several shapes and sizes.
Dripicons is a set of 84 free icons that you can use for your projects or apps.
Modern arrows and reload icons
Circle Icons Pack