Is there a Fluther-like Q&A platform for use in the enterprise?

I would like to know if there is a ready-to-use framework similar to fluther that we can deploy within a company—

It would be a great way to improve collaboration and sharing of expertise across the organization.

If you have any other suggestions to implement this better, you are welcome. Thanks!

We have an existing MS Exchange, and SharePoint infrastructure that we could leverage if required.