Like, I get that Free Software as a movement is about software being libre, not gratis. But how many examples are there where being libre has not meant being gr

Like, I get that Free Software as a movement is about software being libre, not gratis. But how many examples are there where being libre has not meant being gratis? And I don't mean the Red Hat sort of case where the software itself is gratis (yes, you have to go all the way over to CentOS to get it gratis) but support costs, I mean an example of being able to charge actual consumers for a piece of libre software.