http://www.iconarchive.com/show/flatastic-11-icons-by-custom-icon-design/Application-icon.html
"Application Icon"
Artist: Custom Icon Design (Available for custom work)
Iconset: Flatastic 11 Icons (60 icons)
License: Free for non-commercial use.
Commercial usage: Buy commercial license here: http://www.customicondesign.com/free-icons/flatastic-icon-set/flatastic-part-11

http://www.iconarchive.com/show/oxygen-icons-by-oxygen-icons.org/Apps-system-software-update-icon.html
"Apps system software update Icon"
Artist: Oxygen Team
Iconset: Oxygen Icons (883 icons)
License: GNU Lesser General Public License
Commercial usage: Allowed