Python is not licensed under the GPL, and it is not clear to me that they care about this sort of thing.
As for Mono, I was there at the conception of the project, and can thereby tell you off the top of my head that if you go to the History section of the documentation they have an archived copy of the premise, and it is dropping with "free as in freedom" language.
http://www.mono-project.com/archived/mailpostlongreply/
(More "current", "Free Software" also listed as a "Feature Highlight" in the about page.)