Group Policy Management in .NET

Windows Group Policy is a powerful tool, and from time to time I have wanted to manage it with a .NET application rather than through the normal Group Policy Management Console, for automation and such. After some research, I determined that it is really difficult to do anything interesting without the official GPMC. Fortunately, there is an official .NET library called, appropriately if not creatively, the GPMC Class Library. It can legally only be obtained by installing Remote Server Administration Tools and then enabling the Group Policy management features, so it can't be redistributed, but at least it's free.