WireframeSketcher icons are licensed under Creative Commons’ Attribution-ShareAlike 3.0 Unported License (CC BY-SA 3.0) – https://creativecommons.org/licenses/by-sa/3.0/
If you use these icons, please add a link to WireframeSketcher (https://wireframesketcher.com) somewhere on your website or in your app.
You can get icons from WireframeSketcher GitHub repository.
Icons that are available from Mockups Gallery are licensed under their own terms.