The vast history of Hearts of Iron III modifications makes trying to find what's complete and updated a difficult task, as nearly 15 years worth of projects remain nestled in these forums. Sadly, most of these modders and creators have moved on to do other things. There are however, a handful of mods that remain active to this day.
This list encompasses major projects that have been updated within the last 2-3 years. Though there are some small fan patches for other legacy mods such as the WWII Immersion Mod floating around the forums, this list is meant to stick to projects that have a more maintained direction.
The OldParadox Community Project
A brand new Discord and Subreddit community centered around games & titles by the Paradox Development Studio predating Europa Universalis IV (2013), the most prominent of which being Crusader Kings II, Hearts of Iron III, Victoria II, and Europa Universalis III.
At the bottom, this is meant to facilitate conversation between modders of HOI3 since there are a ton of interesting concepts and projects in the space right now, as you can see below.
Black ICEDownload Thread / Mod Forum / Most recent version: 11.3.4 (April 22, 2023)
Currently Maintained / Developed by: BICE Team, primarily @oumajgad, @dsafe, & @DasGleiche
The Largest HOI3 total overhaul by far, hundreds of new everything. The mod is aimed to make the game a better simulation of what the WW2 was.
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Historical Plausibility Project (HPP)
Download Thread / Mod Forum / Most recent version: 3.4.0 (Aug 16, 2021)
Currently Maintained / Developed by: @SSmith, with regular contributions from other users
A mod with the goal of helping the game reach its full potential as a half-historical / half-sandbox game. The mod features vastly improved AI, historical OOBs for every nation, complex internal politics, a reworked leadership system, HOI2-style doctrines, capital ship modernizations, over 6,000 unique unit pictures, and much more.
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Downfall
Download Thread / Most recent version: 1.4.0 (July 20th 2022)
Currently Maintained / Developed by: @Paglia
A vanilla+ oriented compilation mod with a heavy emphasis on improving the base game.
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A HOI3 Treasure Chest
Download Thread / Most recent version: 4.0.5 (Jul 12 2020)
Currently Maintained / Developed by: @Chromos
Expansive and modular vanilla+ mod featuring map changes, event chains, new AI, new scenarios and so on.
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Imperium Mod
Download Thread / Most recent version: ??? (April 16 2023)
Currently Maintained / Developed by: @YUGULO
An interesting mod with a massive timeline beginning in the early 1800's.
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Triumph & Tragedy (WIP)
Discussion Thread
Currently Maintained / Developed by: @MathGuy Returns
A highly ambitious new concept that is attempting to fix the map projection and add a greater level of complexity to the map. Unreleased.
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Hopefully there are many more to add in the future, happy modding everyone!
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