Virtus is a set of free wargames rules for miniature wargames set in the Gallic Wars. The game, aka “Bravado”, uses a card mechanism and no rulers!
The Miniature Wargaming Editor
Making Rocky Terrain From Wood Chips
Here’s a nice tutorial on making rocky terrain from tree bark chips.
Making a 15mm Graveyard
Here’s a tutorial on making a graveyard for 15mm scale figures. It could easily be scaled up, though.
Working With Tree Armatures
Here’s a good tutorial on working with tree armatures.
Aquanautica Imperialis Submarine Rules
Aquanautica Imperialis is a set of free wargames rules for naval battles in the Warhammer 40K universe. The underwater rules are found here.