White is a .NET UI automation library and toolkit for Windows. White supports all rich client applications, which are Win32, WinForm, WPF and SWT (java).
It is .NET based and hence you wouldn't have use proprietary scripting language. You can use your favourite .NET language, IDE and tools for developing tests/automation programs. White provides consistent object oriented API for all kinds of applications. Also it hides all the complexity of Microsoft's UIAutomation library and windows messages (on which it is based).