The Word Forge, out of all of them, sounds a little portentous and self-aggrandising, possibly because it focuses on the means and not the object of production.

So I went for the ones which focused on the latter, and of the two I reckon moltenwords works better. It emphasises that the material you're dealing with can be changed and adapted to suit the client's needs (which burnishedwords doesn't quite achieve). Overall I reckon it sells what you do better than all the other suggestions.