This tool generates additional methods to use WCF Services with aysnc/await with .NET 4.0.
It can generate these methods in C# and VB.NET.
This is a simple command line tool which loads an assembly and generates TPL methods which can be used with async/await. For .NET 4.5 projects these methods can be generated with Visual Studio 2012 and later, but it doesn't create them for .NET 4 projects.
For further information see the documentation.
This tool can't create TPL methods for operations which have ref/ByRef parameters. For these methods it would need to create the message contracts.