Lord of the Rings mod is unstable but fun. You will get crashes. So many crashes. Game of Thrones mod is pretty stable at this point, I'm not a fan of some of the features, but other than that, it's p. good. There's a ton of useful mods packaged together in the Historical Immersion Pack mod as well.
A Mod based on The Elder Scrolls series, AKA Oblivion, Skyrim, Morrowind, etc. It is still technically a work in progress, and the last update was a few years ago on Moddb anyways. But it's comprehensive and balanced enough that that doesn't really matter