Today you have atthe Warlord Games webshop three rulesets in free digital download. All three are worth it, so you know. The rules are:
Black Powder that includes a module for the 1st Carlist War 😀
Pike and Shoote, for the period of the English Civil War / 30 Years War 😀 😀
Hail Caesar for the ancient and medieval period.
The three rules share mechanics, but they are different and give «good feeling» of their historical period.
Here you have the link to the page of the WG store where you can get the pdfs
Totentanz Miniatures 