Sandcastle Help File Builder provides a GUI front end to the Microsoft Sandcastle documentation generator tool. As Scott Hanselman has reported, NDoc, the former de facto standard source code documentation generator for .Net has been defunct for some time. I finally downloaded Sandcastle, Microsoft's attempt to fill the void left by NDoc, today, and was not at all happy with the amount of time I spent tweaking the scripts, which involve running 10+ separate command line tools, all of whose command line parameters or other details have changed since the instructions were written.