De Bellis Vietnam is a set of DBA-based quick and dirty rules for wargaming Vietnam.
modern
Chechen Conflict Rules
Here’s a one-page set of free wargames rules for the Chechen Conflict, with figures based on on stands.
Indo-Pakistani Campaign for Not Quite Mechanized
Chris Kemp has a mini campaign for his Not Quite Mechanized rules.
Derelict Commercial Building Paper Model
Stoelzel’s Models offers a free paper model of a derelict commercial building.
American Football League Rules
Here’s a set of rules for American style football games.