[diffeomorphism]

Great software should be paid AND respect your freedom:

https://www.gnu.org/philosophy/selling.en.html

Conflating freeware and free software is a really annoying flaw of the English language.

[eindiran]

I think using the "gratis" vs "libre" distinction can help alleviate the issue: https://en.wikipedia.org/wiki/Gratis_versus_libre