Starting off with a big one, A World of Ice and Fire is a mod based on G.R.R. Martin's book series, A Song of Fire and Ice. The new world gives you the opportunity to step up and take the Iron Throne for yourself, ruling Westeros however you see fit.
The mod includes Westeros and Essos, the appropriate factions for both continents, and even the Whitewalkers. With all the options this mod gives you, it would be well within your ability to raise an army and kick in the teeth of your least favorite characters from the show or books.
The mod was well received by the community and currently holds an average rating of 9/10. Minor complaints were noted with people who experienced some bugs, but the hype surrounding this mod paid off in a big way.