Aquanautica Imperialis is a set of free wargames rules for naval battles in the Warhammer 40K universe. The underwater rules are found here.
Making 15mm Hedges
Here’s a tutorial on making a 15mm hedges.
Cutting Form Hills Tutorial
Here’s a useful tutorial on cutting foam hills.
Old West Buildings Tutorial
Cowtown Chronicle offers an extensive tutorial on building Old West buildings.
Cargo Pod Paper Model
For your science fiction games, here’s a free paper model of a cargo pod.