Google Material Design Icons for XWT and Mono.
Material design icons are the official icon set from Google that are designed under the material design guidelines.
Google has made these icons available for us to incorporate them into our products under the Apache License Version 2.0. Google would love attribution in our app's about screen, but it's not required. The only thing Google ask is that we not re-sell these icons.
XWT is a cross-platform UI toolkit for creating desktop applications with .NET and Mono.