Very Civile Actions is a set of free wargames rules for the English Civil War. Like all games from Perfect Captain, this is very professionally done.
Rules: Pike and Shot
Scottish Rebellion Reules
From Ebob miniatures, a set of miniature wargaming skirmish rules for the Scottish Rebellion of William Wallace in 1297 called Rebellion
Galleon Wargames Rules
Galleon is a set of wargames rules for naval combat in the 1400s and 1500s — the Spanish Armada period.
New World DBA
New World DBA is a set of amendments and lists for playing DBA games in the New World: Tupis, Aztecs, Incas and Conquistadors
The Galleon and The Flame
Trevor Brabyn has posted The Galleon and The Flame, a Sword and The Flame variant for land and naval battles in the age of Drake and Hawkins.
This is just more evidence to support my contention that — if miniature wargaming has a standard — it’s Larry Brom’s The Sword and The Flame. There are more variants of this rules set than I can count.