Mantic’s Kings of War, Second Edition is now available as a free download. There are also several free Army Books.
I can’t help but thinking that this game is the successor to Warhammer Fantasy, which Games Workshop has essentially abandoned.
Mantic
Working With Mantic’s 20th Century Red Brick Terrain
For their Mars Attacks game, Mantic released sets of 20th century style brick ruins. They’re good looking, but with a little work can be even better.