War of the Ring: The Lord of the Rings- Strategy Battle Game is a relatively expensive rules set from Games Workshop. But if you already have a set, you may be interested in these houserules.
Lord of the Rings Express is a free print-and-play game based on the cooperative Reiner Knizia game. The express part is that it plays in a more streamlined, faster fashion without apparently losing the feel of the original.
Here is a beautifully done SAGA battleboard for dwarves in the Lord of the Rings
Given the popularity of Smaug, the inclusion of Dragons in the Lord of the Rings Strategy Battle Game is a natural.
A Saga battleboard and army list for the forces of Isengard from the Lord of the Rings.