Skyrim Extended Cut is an in-progress mod that aims to remix Skyrim's main questline, with promised inclusions like "expanded third act, Dragonborn DLC main quest integrated with Skyrim main quest, more characterization for Alduin & Miraak, more Thalmor involvement, Blades faction overhaul, more stuff to do in Blackreach, mostly new core cast, focus on player agency, guild and side quest completion impact on main quest", and so on. It's intended to make the storyline at the actual center of Skyrim worth engaging with, the whole dragons-and-shouting thing so many players ignore in favor of sidequests...
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Saints & Seducers Extended Cut makes Skyrim Anniversary Edition worthwhile at last
Source: PC Gamer (opens in a new tab)