A free program for Windows, by MorguLord.

The Battle for Middle Earth – The Rise of the Witch-King is a real-time strategy game based on the Middle Earth universe, and it’s a part of the campaign of the same name. In this mod, you will have the opportunity to fight in the battles of the third age against various types of monsters and other hostile and friendly units. The units of the enemy will be different, and the way you fight will be different as well.

In addition to the new enemy units, you will also have new weapons, armor, and new spells to help you win the battle.