PZ8 WWII is a set of free wargames rules for fighting battles of the Second World War using 6mm (microarmor) wargames miniatures. They’re at the 6mm Yahoo Group.
PZ8 Sci Fi is a set of free wargames rules for using 6mm (microarmor) figures in a science fiction setting. They’re available on the Yahoo 6mm Wargames Group.
PZ8 1950-69 is a set of free wargames rules for using 6mm miniatures to refight battles of the mid to late 20th century. They’re at the 6mm Miniatures Yahoo Group.
Fast and Dirty 6mm Combat is a set of — well, fast and dirty 6mm science fiction combat rules. It’s just two pages long.
The AD Wars is a set of science fiction rules based on the Warhammer Ancient Battles Rules. You can get them on the Yahoo 6mm Science Fiction group.