This is a genuine question. My impression is that the set of software that is wholly libre but is not available gratis, is an empty set.
However, my knowledge of libre software is limited compared to that of this mailing list's users. If you know of any examples of software that are libre but not available gratis, I would be grateful to know about them. My impression is that Red Hat Enterprise Linux (RHEL), for instance, is not in that set, because the parts of RHEL that are not available gratis are also not libre, and so RHEL as a whole is not libre (even though *most* of its constituent parts are indeed libre). Thanks! Sam Pablo Kuper P.S. In case you are curious why I am asking this, it is because I am editing a Wikipedia "draft" to offer guidance to Wikipedia editors writing about software. I am trying to determine whether there is a need to provide guidance for writing about software that is libre but not gratis. Here is the current version of the draft. The draft is absolutely a work in progress. The second row in the table is the relevant one: https://en.wikipedia.org/w/index.php?title=Draft:Don%27t_call_non-free_software_%22free%22&oldid=706569795#Summary
