How to use WinSCP

We need to set up WinSCP here on our local network so that the users at other location can access the files here through the secure mode.

How to go about this?
Is WinSCP only a client for SSH?
Is there any free Server available for SSH?

PS wrote:

Is WinSCP only a client for SSH?

Yes, only client.

Is there any free Server available for SSH?

For what platform?