Ironclad American Civil War Naval Rules

From the Naval Wargames Association comes Ironclad, a set of free wargames rules for ACW ironclads.

Daimyo Samurai Rules

Daimyo is a set of free wargames rules for samurai battles in 15mm.

From the website:

Daimyo is a set of wargames rules intended for use with 15mm scale wargames figures but can easily be used with other scales (although I for one won’t be painting any 6mm samurai!). The rules cover the period known as The Age of the Country at War or Sengoku-Jidai. This was a period when samurai armies became much more organised, the importance of the ashigaru infantryman was recognised and the increasing use of firearms altered samurai warfare forever. It was also an age that produced some great commanders such as Oda Nobunaga, Toyotomo Hideyoshi, Takeda Shingen, Uesugi Kenshin and Tokugawa Ieyasu to name but a few. And, in a period of continual warfare, there were hundreds of battles, some of them epic encounters like Nagashino, Sekigahara and Kawanakajima. It is my hope that Daimyo will capture some of the excitement of this colourful and unique period of history

Three Inch Glory Playmobil Wargames Rules

Three Inch Glory is a set of free wargames rules for battles with Playmobil figures. The games are set in the 18th Century.

Cute.

Land And Airborne Assault Rules

Land and Airborne Assault are a set of free wargames rules that cover warfare from 1950 to the present. From the website:

Land and Airborne Assault is published in PDF format, is printer friendly and suiteable for all micro armour scales.
Land and Airborne Assault rules cover warfare from 1950 to the present day.
They include Electronics, Engineering, Artillery and Aircraft support plus Special Forces
and RPVs. The 4th edition has improved CAP air to air combat rules.

Pre-Game rules allow you to carry out a reconnaissance, flanking attack, sabotage and assassinations.
The morale reactions reflect actions troops and units would take on the modern battlefield.
Some dice rolling normally associated with modern warfare rules have been simplified making it possible to played a large game in a afternoon or evening.

Data specific to these rules for AFV armour class’s, size and speed, ATGM speed, generation and size, Aircraft size and payload and Artillery ranges is supplied on this website in the data and information section.