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All my favourite mods have already been mentioned.

BUG is the basic mod that I always use in my games. No gameplay changes, just a better user interface that displays information that is already visible to the player in a more user-friendly way. I probably wouldn't be able to play without it anymore.

Rhye's and Fall of Civilization adds a unique and alternate way to play, while keeping most of the game rules. Each game becomes an alternate storyline, but resembling real history. For beginners though I would advise to play the vanilla version, since the modmods significally alter a lot of game systems (civics, tech tree) and for your first game you will have enough on your plate getting used to the new mechanics (civilization spawning, stability, congresses, unique abilities, unique victory conditions...). One of my favourite features is that, because of a small tweak to how defensive pacts (military alliances) work, you are very likely to be involved in one or two World Wars per game, with almost every civilization battling in one side.

Fall from Heaven II is a whole different game. It is an explosion of worldbuilding, storytelling and fantastic gameplay in a dark but charming setting. This mod includes several new civilizations with unique mechanics, an alignment system that shatters how diplomacy works, global and unit-based magic and spells... and keep counting. The existence of mods such as this makes Civilization IV even more valuable, unsurpassed by any other title in the series; I would probably buy a standalone Fall from Heaven for what the base game costs.
Similar to Fall from Heaven II is Erebus in the Balance (EitB).

NB: EitB is not found on the civfanatics web site it is at Realms Beyond website:
http://www.realmsbeyond.net/forums/showthread.php?tid=7646
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oninowon: Caveman2Cosmos is the best mod for CIV IV in my opinion. It extends the gameplay from the very beginning to late game. However, you will need a 64 computer. When I installed it on my old 32 computer it constantly crashed.
Latest release ( 2016 december ) http://www.moddb.com/mods/caveman2cosmos/downloads/caveman2cosmos-v37
Well, if you guys like Fall from Heaven, you should def check out the submod More Naval AI:
https://forums.civfanatics.com/resources/more-naval-ai-ffh-mod.14499/

From the dev page:
"The original purpose of this mod was to once again get the AI sailing the high seas. It has since expanded to include numerous AI enhancements and tweaks.

It also incorporates the B.U.G. interface mod and Enhanced WorldBuilder."
Many goodt mods have been already mentioned above. Also, many great mods came with the base game and the expansions. Be sure to take a look at them. Last frontier comes to mind. Fall form Heaven: Ice Age is a great prelude to Fall from Heaven 2. There is much more.

About downloadable mods, my two cents will be for Dune Wars. If you like Dune and Civ, odds are you will like it. Try selecting the warring Houses in a way that makes sense (or not, if you want Muad'Dib to face Duke Leto and so on).

There is a modmod called Dune Wars Enhanced that promises improvements, although I still have not tested that. Anyone?
Post edited May 22, 2017 by Carradice
Hi, I am unable to use mods like Neoteric world or Gold. It seems to work fine. Its even loaded without visible problem. However no new civilization, leader or tech... some smaller mods works fine (Bohemia, Israel, ...)