https://github.com/slashdotdash/faker-cs
This is a free library that can be used to connect to a C# infrastructure to generate fake but presentable data.
The thing I currently like about this is that, in my current environment, I need source code only. Already compiled programs are frowned upon, and so, source code based utilities that can be compiled on-site, so to speak, are the thing to have and to get.
One of my most favorite utilities of all time is decidedly NOT open source, but free, and so, again, in the current environment, I can't use it.