WarEngine is a set of universal miniatures rules that was the basis for the relatively well-received ShockForce game. ShockForce is now out of print — although miniatures can still be found. You can still get the WarEngine rules, however at the WarEngine Yahoo Group, or via the Wayback Machine. They’re also available at Wargames Vault.
Napoleonic DBA Rules
Steve Burt has a set of free wargames rules for playing Napoleonics using DBA mechanics.
Modeling Stone Block Walls
Tips for modeling stone block walls.
Prehistoric Pocket Dinosaur Hunt Game
Prehistoric Pocket is a game of Lost World Dinosaur hunts. Interestingly, it uses coin flips instead of die rolls to resolve actions.
Medieval Skirmish Rules
Bob Beattie offers a set of Medieval Skirmish Rules.