Free icons for web designers available under a Creative Commons license can be downloaded from many websites available on the web. I will describe couple of them as this is best place for me to write it down.
Icons by Mark James
Icon sets can be downloaded directly from the developer’s website.
Silk
Set of one thousand small and smooth icons. Available using direct link.
This work is licensed under a Creative Commons Attribution 2.5 License.
Flags
Set of 248 icons representing most countries in the world. Available using direct link.
Icons are available for free use for any purpose with no requirement for attribution.
Mini
Set of 144 small GIF icons available for free use for any purpose. Available using direct link.
Icons are available for free use for any purpose.
Icons by Yusuke Kamiyamane
Icon sets are available on the designer’s website.
Fugue Icons
Set of 3,480 nice looking icons.
Icons are licensed under a Creative Commons Attribution 3.0 License.
Diagona Icons
Set of 400 colourful icons.
Icons are licensed under a Creative Commons Attribution 3.0 License.
Icons by Tina Mailhot-Roberge
Somicro and its bigger version Somacro icon sets are available on the designer’s website.
Somicro
Set of 29 icons covering most of the popular social networks. Available using direct link.
Icons are licensed under Creative Commons Attribution Share-Alike 3.0 Unported.
Icons by The Regional Computing Centre of Erlangen
Set of 398 standard icons can be downloaded from the project’s website.
Icons are licensed under a Creative Commons Attribution Share-Alike licence 3.0.
Icons by Map Icons Collection project
To see and download icons visit the project’s website.
Icons are licensed under Creative Commons Attribution Share-Alike 3.0 Unported.
Icons by Dotvoid AB, Malin Holm
Set of 26 pretty weather icons. Icon set can be downloaded directly from the developer’s website.
Icons are licensed under a Creative Commons Attribution No Derivative 3.0 Unported License.