Before Skyrim, Oblivion, and Morrowind there was Daggerfall, the second entry in what has become a household name for fantasy RPGs. The original is available on Steam and GOG, though 23 years later we have a modern remake in the form of Daggerfall Unity which brings in modern graphics, controls, QoL improvements and mod support (as well as Linux and Mac support).
Just because the company has been scummy doesn’t mean that unity stopped being one of the best free game engines available. I like godot but it’s not even close, they just don’t have the resources and man hours spent yet.
https://www.gnu.org/philosophy/free-sw.en.html
Obviously not FOSS or I would’ve said that, but there is objectively a free tier for anyone to use.