The Last Days of the Third Age — a total conversion of Mount and Blade 1.011 and Warband into J.R.R. Tolkien's Middle Earth.
The best Middle-earth simulator there is. Period.
However, do note that this mod is NOT a sandbox like vanilla. You can't have your own faction, can't siege, there are no trade or enterprises or Diplomacy or Freelancer, there are no taverns, etc. By the "end" of a playthrough, only good or bad factions are left standing, and most of the map has been destroyed. Also, no famous companions.
An excellent War of the Ring simulator, really. I just hoped they did something beyond that.