In Clouds of Glory is a set of free wargames rules for World War One aerial combat.
Miniatures Rules
Supreme Warlord: BloodLust Fantasy Rules
Bloodlust is a set of free wargames rules for fantasy battles with 15mm figures. The author writes:
SUPREME WARLORD: BLOOD LUST is a set of rules designed to create massive battles using 15 mm Historical pre-1600 castings and/or Fantasy castings. The Blood Lust Series is an effort to get new players into historical and miniature gaming. The rules in this series will focus on combat and inflicting casualties because new players tend to understand blood flowing and the visual affect of depleting units. Morale and command control rules are a factor but do not dominate play.
In the fantasy version, the World is in the midst of conflict dominated by several races embarking on quests of global domination. Resistance has been fierce and costly to all sides causing the war to escalate into wars of Racial Extermination.
Dreadnought Arena Combat
Dreadnought Arena Combat is a set of free wargames rules for arena combats between war machines.
American Football League Rules
Here’s a set of rules for American style football games.