Question

Can a S/W company license the FB KE application?

Answer 1

No. From this blog post:

Q: I am interested in creating a private, internal Stack Exchange inside my organization.

We no longer offer such a product.

Q: I want to create a Stack Exchange to make a support site for my product.

You will have to use the new process to propose and create the site.

Answer 2

There are several clones of Stack Exchange being worked on. For example, http://www.osqa.net/