The Crystal Clear icons are licensed under the GNU Lesser General Public License (LGPL).
http://commons.wikimedia.org/wiki/Crystal_Clear
http://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License


The Deleket Deviantart icons are licensed under a Creative Commons Attribution-Noncommercial 3.0 License.
http://deleket.deviantart.com/art/Button-Icons-Pack-58987743?q=gallery%3Adeleket%20randomize%3A1&qo=1
http://creativecommons.org/licenses/by-nc/3.0/

The imacadam icons are licansed unter a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0
http://www.imacadam.com/

The DevCom icons are Free for non-commercial use.
http://www.veryicon.com/icon/Hardware/DevCom%20Network/readme.txt
http://www.devcom.com/