Free Pixel Icon Sets For Web designers. However with more designers offering complimentary downloads. These icons are extra high quality, and they look absolutely stunning.
Pixicus Icon Set: 106 Pixel Perfect Icons
Pixel UI Icon Set
Pixels Icon Set (PNG/CSH/PSD)
The icon set contains 58 pixel-perfect icons which you are free to use in personal and commercial projects. The download includes the PSD, the CSH file for the shapes, and PNGs.
MimiGlyphs
Hand crafted, Infinitely scalable Icons for User Interface Designers. 80 icons, 16 by 16px. Photoshop file, CSH file & PNG. Free for personal and commercial use.
Micro Icon Set
This on includes 110 icons in total and is 16×16 pixels. This is entirely vector and can be scaled to any size if needed. It also includes a photoshop PSD like always.
Free Retro Icon Set
Download
160 Tiny Icons
350 pixel perfect glyphs icons
A set of 350 pixel perfect glyphs icons, perfect for apps, websites or just about anything you can think of.
128 16px Toolkit Icons
Shopping Icons
Glyph UI Icon Set
Blue Icon Set
This icon set “OpenStudio Blue Set Icons” includes 126 icons in various themes. Their simplicity allows a multi support use
Also check out: 20 Business Icon Sets