By Fire and Sword is the free version of a commercially published set of rules for the wars of Polish Lithuanian Commonwealth against Turkey, Muscovy, Sweden, the Crimean Khanate and the Cossacks.
I fell in love with the period some years ago when I read a trilogy of books — With Fire and Sword, The Deluge and Fire In The Steppe — that was set in the period. The Polish author, Henryk Sienkiewicz, won the Nobel Prize for literature.
Rules: Pike and Shot
Twilight of the Sun King
Twilight of the Sun King is a set of free wargames rules for fast play battles set in the War of the Spanish Succession. What makes them interesting is that there is no shooting or melee phase. Instead, units in melee or shooting range make morale checks against fire, which is presumed to be occurring.
Capitana Wargames Rules For Galley Warfare In The Mediterranean
Ray Lucas offers Capitana, a set of naval rules specifically for 16th Century galley warfare in the Mediterranean. They were written for the NLWG 2009 convention game.
Pikes and Gendarmes
Pikes and Gendarmes is a set of big battle rules that had their origin as a variant of Larry Brom’s seminal The Sword and The Flame. This is set, obviously, in the Renaissance era.
The Sword and The Pike
The Sword and The Pike is a renaissance variant for Larry Brom’s classic The Sword and The Flame.