What is Black ICE?

Black ICE is a Major Overhaul of Hearts Of Iron 3. The Grand Strategy game by Paradox Interactive.

What does ICE add to HOI3?

Literally hundreds of events, both from ICE (optimised for FTM and the Community Map Project) as well as many new custom made events. Includes many events for all the majors and specific theatre events such as Barbarossa and North Africa.
80+ unique techs (many from ICE)
60+ unique units (including SS and Soviet Guards)
New loading screens and sound effects thanks to Antenociti and Death6
Thousand hours of bug fixes and play balance building on the unique units and techs from Mk V to Patch 10
100's of ICE events and new customised events.

Here is the FAQ Thread

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Official Moddb Page : Black ICE Mod for Hearts of Iron III: For the Motherland - Mod DB