JUGS is a set of free wargames rules for science fiction combat with giant robots.
Giant robots. How can you go wrong?
The Fantasy Trip Compendium of Resources
Metagaming’s The Fantasy Trip is one of my favorite games of all time. It’s one of the core products that drew me inexorably into the gaming world. Here’s a page with a great number of resources for The Fantasy Trip.
Dragon Fight Aerial Combat Rules
Dragon Fight is a set of free wargames rules for aerial dragon combat.
Fokker Fodder
Fokker Fodder is a set of free wargames rules for World War One aircraft battles. The rules are designed for both single battles, and for campaigns.
A Town Called Malice Wild West Rules
A Town Called Malice is a set of free wargames rules for wild west gunfights. The rules set was used by the North London Wargames Group for their 2015 club convention game.