Steel Ships and Iron Hearts is a set of free wargames rules for pre-dreadnought naval combat. The rules set dates to 1982 and was played by the Olympic Wargaming league. Classic stuff.
Making Jungle Trees
The Wargame Terrain Blog has a photo tutorial on making jungle terrain.
Making Haunted Woods Bases For Your Miniatures
Here’s a tutorial on making a Haunted Woods base for your miniatures. THe video is aimed at a single base for a miniature, but I think the techniques could be extrapolated to more general base terrain.
Micro Rome Print and Play Game
Micro Rome is a free print and play board game in which a player tries to populate Rome and score 45 points before the Coliseum is built.
Medieval Mayhem Rules
Medieval Mayhem is a set of free wargames rules for medieval battles. The author writes:
Put your tin soldiers on the table and play a medieval battle for an evening’s entertainment. See your soldiers rush the enemy, fight or flee while you desperatly try to control them. Medieval Mayhem is a game where your soldiers have a will of their own.