Wizards of the Coast has this 25mm – 28mm papermodel of a medieval cottage. You could print out a whole bunch of these and have a whole village for your miniature wargames skirmishes.
medieval
Lord Merlin’s Rules of Engagement
Lord Merlin’s Rules of Engagement is a set of free wargames rules for medieval style wargames. What makes these unique is that they are designed for large scale (70mm) figures. Despite the “Lord Merlin” monicker, there doesn’t seem to be a fantasy component here.
Mindstalkers: Mission Middle Ages
Mindstalkers: Mission Middle Ages is a set of rules for skirmish games in a medieval setting.
One Man One Knight Medieval Rules
One Man One Knight (OMOK) is a set of free wargames rules for medieval skirmishes.
Battlestorm Miniatures Combat System
Battlestorm is a set of free wargames rules for medieval fantasy.