Use of icons is no longer trend it is an essential part of any design. Being a small tool of communication it helps to make design more readable and advanced. Also icons play a vital role in application interface design especially those which dedicated to mobile industry. Due to lack of space tiny easy-to-understand icons reveal its advantages and power.
In the list below you will find more then 100 different pixel-perfect icons packs that is divided into 2 categories. First one consists of assorted glyph icons without any particular style, and second one represents themed styled icons (including weather icons, modern touch screen icons, flag icons, food icons, artistic icons, hand-drawn icons etc.) Most of them were created by talented designers from Dribbble community. Each package has more then 10 and in some cases even more then 100 items. Usually they are free for personal and commercial but there are those which has special license. So be careful.
I hope you find something useful for your next project.
Enjoy and Good Luck!
Assorted Glyph Icons
3.Clean Icons in 3 dimensions: 16×16, 32×32, 64×64 
7.32x32px Icons by Roman Bulah 
8.Mustico Iconset by mustafa kural 
9.30 Free Vector Icons by Navdeep Raj 
10.Batch – Email Pack by Adam Whitcroft 
11.16x16px Icon Set by Roman Bulah 
18.50 Icons Part Two by Victor Erixon 
22.Thin Line Icons in ai format 
23.Chunky Pika Icon Set in png and ai format 
24.Pixel Icons Dribbble by Tomas Korosi 
25.Layouts icons freebie by Ales Nesetril 
27. 126 Icon Set 
28.40 Icon Set 
29.Freecons v.01 by Jiri Silha 
30.Batch – huge collection of free icons for every need 
35.16px Broccolidryiconsaniconsetitisfullof…icons
36.Lovelicon Set – Handcrafted cute little Loveli Icons 
38.Assorted Pixel-Perfect 14px Icon Set 
40.UI Icon Set by Matt Gentile 
44.iconmonstr – free simple icons for your next project 
45.Listicons – Arrows & Bullets Webfont by Tony Thomas 
49.Circlicious
51.Premium Pixels Icon Set (PNG/CSH/PSD)
52.350 Pixel-Perfect And Free Glyphs Icons
56.Vector icons
59.20 pixel-perfect glyph icons 
60.Sustainable Business Icon Pack
61.Minicons
65. Stylistica Icon Set (available free version)
66.Bijou
69.New Designers And Developers Icon Set
70.simpl
71.Vector Web Icons (91 Icons)
Themed and Styled Icons Packs
2.Travel Icons by Gavin Elliott 
5.A set of 4 icons for retro theme 
7.Redraw 50 Chinese Website Favicons by Ashung Hung 
8.Touch Gesture Icons. Designed for Multi-Touch Devices 
10.Apple devices iconset by Oleg Laptev 
11.210 Free Icons for Windows 8 by Oliviu S 
12.30 Hand-Drawn Icons And Photoshop Shapes 
13.Foodicons by Sergey Zolotnikov 
15.Meteocons 
18.Academic Icon Set (10 Icons + PSD Source)
19.Ico Weather 
21.Business and e-Commerce Icons Set 
24.Music glyphs by Ivan Kutcher 
25.SweetiePlus
26.Architecture Blueprint Icon Set (only for personal use)
27.Freshy icons
28.75 climatically categorised pictographs
29.Adobe CS6 Replacement Icons
35.Icons
39.Strabo II
40. Cloud icons
41.Icons 
