Yup, they're free! Just to let you know, though, Galaxyforge3 is not working right now. It won't start up at all. Stardock knows about it and it's on their list to fix, but last time I checked (earlier today) it's not up yet.
As a side note to this, Annatar, do you know if I can get a hold of an earlier version of Galaxyforge somehow?