September 2016 Update:
71 Free Animal Icons
Here we have for you an animal themed collection of 71 colored icons that would make a nice addition to your resource library
100 Airline Icons
Download 100 beautifully-crafted line icons perfect for your UI designs, infographics, and other creative projects. The package comes in all popular formats: Ai, Sketch, SVG, and PNG.
30 Isometric Icon Set
Treat yourself to this collection of 30 flat isometric icons inspired by the account industry. All icons included in the set are fully-editable and customizable in Illustrator and come in various PNG sizes.