Nam ’69 is a set of free wargames rules for company level rules in the Vietnam Conflict. In the game the players control American squads, while a referee controls the Communist forces.
Other game resources:
The Miniature Wargaming Editor
The Anglo Saxon Invasion Documentary
from the BBC. I love the Dark Ages as a gaming period.
Making Scale Model Rubble
Skankgame has a good article on making scale model rubble for your miniature wargames.
Bosconian D Solo Board Game
James Catalano offers Bosconian D, a free solo boardgame based on the classic Namco video game. To find it, you have to scroll down to the bottom of the page, past his (very cool) retro video games downloads.
Japanese Tori Paper Model
Here’s a paper model of a Tori — the traditional Japanese gateway. You should be able to scale the model with software and your printer to fit your needs.