Chris Kemp has a mini campaign for his Not Quite Mechanized rules.
Republished by Blog Post Promoter
Rules: Modern
American Football League Rules
Here's a set of rules for American style football games.
Republished by Blog Post Promoter
Low Level Hell
Low Level Hell is a set of free wargames rules for helicopter actions in Vietnam.
Vehicular Pursuit Rules For Fistful of Kung Fu
The Osprey Rules A Fistful of Kung Fu 
don't include pursuit rules for vehicles, so Pijlie wrote his own.
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Army Men Skirmish Rules
Army Men is a set of free wargames rules designed for use eith the classic plastic army men.