The tag free-software keeps being re-created, but in practice it is ambiguous, which is why we don't use it. I just went and retagged the 5 questions that had it — 2 clearly meaning FOSS, 2 clearly meaning “I don't want to pay money” and one probably meaning “I don't want to pay money”. The spread illustrates the ambiguity.
By the way,
free used to be disallowed, but for some reason it no longer is. Please disallow it again.