All clever things are usually very simple. Sometimes you just want to stay with the old valuables and keep it subtle. These icons will look great with clean and minimal web designs and also notice since almost all of them are monochromatic you can put different colors, create your own letterpress and different effects without spending time to create your own actual icon.

I think minimal and letterpress effects currently are very popular in webdesigns and many designers will find this collection useful and worth bookmarking!

1. Free Minimal Icon Set

Editable PSD file with Illustrator vectors.

2. Mini Icons

Free icon set from http://www.famfamfam.com/. 16×16 GIF.

3. Mono Icons

108 gray 32×32 PNG icons. You can customize the color. Also free for commercial use.

4. Iconic

Iconic is a minimal set of icons consisting of 114 marks in raster and vector formats. 5 different sizes up to 32×32, nice flexibility. Creative Commons 3.0 license.

5. Pictodeck

Pictodeck is a set of over 700 pictograms in vector format designed specifically for Keynote. That means you can scale them to any size you desire without any loss in quality. All of the icons also support transparency. The set was created by Aaron Richard. All are licensed slightly differently under Creative Commons.

6. Ecqlipse 2

100+ icons in various resolution up to 128×128. Also available as .ico.

7. Letter Pressed Icons

collection of over a 100 letter pressed icons, in various letter pressed styles. The icons include three PSD files which are full of icons which you can drag and drop into your designs. Creative Commons license.

8. Kostenlose Icons

9 GIF icon sets. Creative Commons license.

9. Token

128 icons in light and dark versions. Available as 128×128 PNG or ICO up to 256×256.

10. Eusmis

99 16×16 ICO files.

11. Pictoico

100 fully scalable pictograms/icons. Comes as a AI, SVG, XAR.

12. Social Media Icon Pack

22 500×500 PNGs. Free to use in commercial and personal works.

13. Wireframe Mono

244 (8 cursors) icons optimized for 16×16, 32×32, 48×48. Available as PNG, ICO, GIF. Creative Commons Attribution-NonCommercial license is free.

14. Picol

Massive set of about 500 icons. Available as 16×16, 32×32 PNG or SVG.

15. DOT Pictograms

68 free icons up to 256×256 PNG.

16. Snow Icon Pack

102 royalty free website & GUI icons that can be used for both personal and commercial purposes. Royalty free license. TIFF, ICNS, ICO, ICON, PNG. 32×32

17. UIDesign Icon Pack

51 free icons. PNG, ICO, ICNS. Designed by Alexey Egorov.

18. Pixeley

30 16×16 icons. PNG, ICO, ICNS. Created by el73.be

19. Mini Pixel Icons

320 icons available in various color themes. 14×14 GIF.

20. Pixelated

21 icon in light and dark version. Transparent GIFs.

21. 165 Lovely Free Vector Icons

AI, SVG, JPEG.

22. 135 Free Vector Icons

AI files.

23. Mini Icons

113 10×10 GIFs. Creative Commons Attribution-ShareAlike license.

24. Doctype Icons

42 16×16 GIFs

25. BWPX.ICNS

A free set of over 250 18×18 pixel icons. Each icon was carefully created one pixel at a time using only whole value hexadecimal shades of grey. Creative Commons license.

26. Splashy Fish Icons

450+ 16×16 PNG icons.

27. Hand Pointer Icons

36 icons, 6 different types, 6 color variants.

28. Silk Companion

450+ 16×16 PNG icons.

29. Symbol Signs collection

Available in OpenType font format.

30. Diagona Icons

200 PNG icons. 10×10, 16×16.

31. 30 Free Vector Icons

Icons with apple touch. PSD file.

Do you know some more free minimal icon sets? Let us know!