For a limited time, Warlord Games is offering free digital copies of Black Powder, Hail Caesar and Pike & Shotte
Andy Watkins has these free simple skirmish rules for fighting miniature battles set in the French and Indian War. These rules belong to the “less is more” category.
Fast Play Rules For The Seven Years War is a set of free wagames rules for mid 18th century games.
Braid and Cockade is a set of free wargames rules for game set in the 1750 – 1850 era.