Here is a set of 20 mixed icons including several categories like travel, culture, etc. Free PSD and AI created and released by Handco.
Free PSD Icons
Here is a set of 36 free iOS7 style outline icons. Free PSD created and released by Ava_Q.
Smallicons is a set of 54 free coloured flat icons. The icons were made with Photoshop vector shapes and are available in different formats.
Feather icon set is an ever expanding collection of simple icons. Each icon is 100% vector, meaning each is completely customizable.
Softies is a free set of 44 soft and colourful icons set. Pixel perfect PNGs at 64px, 128px, and 256px along with editable PSDs.
Here is a small set of 9 free icons for creating nice user interfaces. Free PSD created and released by Seven.
Here is an icon pack including 20 simple circle icons. Free PSD created and released by Robin Kylander.
Here’s a new freebie from Sebastien Gabriel. This one is the second volume of a thin rounded icon pack. The PSD includes 35 new thin icons.
This freebie includes 20 iOS7-style settings line icons (brightness, search, volume, etc.). A pixel perfect free PSD designed by Z-YP.
The Elegant Icon Font is a free webfont including 360 icons with 50 new business icons. The pack also includes PNGs and SVGs files.