Earlier quoted context omitted.
Libre. Usually used to denote that we mean freedom not zero-cost when saying “free”
It's French or Spanish for free, because in our languages we split the concept of free beer and free speech into two words. Gratuituous could be used for free of charge since it's what we used in latin languages (which I suppose is the same root as gracious - at least in formal french we replace gratuit with gracieux to mean the same thing). So I wonder if English, tired of borrowing a strange word, will use gracious…
As the sibling says, we do use gratis as a loan. Gracious already means "with grace" (of manners or motions), and gratuitous "excessive" (as in violence)...