BLACK I.C.E. is an extensive mod of HOI3 under development by Panzeroo and many other members of the Hearts Of Iron 3 forum.
New Version of the Mod which overhauls the vanilla game, adding in 1000's of new events, 100's of new units and techs and a much improved AI.
This version reworks the air techs and air units as well as new content such as specialized HQs, pillboxes, fortresses and a huge amount of bug fixes. It is the beta version so there will be some bugs and balance issues remaining to be fixed. Keep watching for hotfix updates over the next few weeks and months.