But to be more clear:
Free as in "gratis" is like "buy one get one free". It means something provided at no cost - ie: "They had a problem with their computer system so they gave me the salad for free"
Free as in "libre" is like "freedom", a more abstract concept about being not being restricted from something or having the right to something.
Software can be "free as in libre", ie: it's open-source. It can also be "free as in gratis" in that it costs no money. But they're different concepts, and have different implications.
Many developers want software to be "free", as in open-source, and confuse that with "I will allocate no resources towards that thing".
I particularly like the "free as in beer", which is a HIGHLY confused term, but I take it to mean: Beer itself is free - it's not patented and anyone can learn to make it. However, any individual beer is a product that took effort to produce, and thus, is not free of charge.