There probably are, but i never searched. i got 80+ plus mods in my Skyrim version, most of them are immersion and realism mods such as Frostfall, Realistic Needs, Cloaks of Skyrim, one that randomizes your location when you start the game and makes the Main campaign an optional sidequest (you start the main campaign only if you go to Helgen) and etc...
IMO thats the great thing about skyrim, i have got three characters to lvl 30+, and in two of those i didnt complete 1 main quest. All about exploring and roleplaying (the most important thing for me in a roleplaying game) your character.