This site has a good history of the Thirty Years War, with lots of of information about the various phases of the war — The Bohemian Rebellion, the Palatinate, etc.. Lots here that I never knew about.
If you’re interested in gaming the ThirtyYears War, there’s a post here about a set of rules for the period.
From The Perfect Captain, Ironbow is one of their series of beautifully illustrated wargames where the graphics are not just eyecandy, but integrated into the rules and play of the game. Truly innovative stuff. Ironbow covers the crusades era from 1096 to 1192.
The owner of the Axis History site cautions: “This is an apolitical site dedicated to the history of the Third Reich and its allies. This is not a Nazi site, and I am not a Nazi.”
Its a good warning, because this sort of thing could easily be abused. That said, this is a good site with lots of information for wargamers. Of particular interest are the sections on the Axis allies, which have lots of good information on the units, decorations and equipment used.
David Manley has written campaign rules for the 1782-1783 naval campaign between the French and British off the coast of India. Manley writes:
Between February 1782 and June 1783 the fleets of French captain Pierre Andre de Suffren de St. Tropez and British Vice-Admiral Sir Edward Hughes fought a series of naval actions along the Indian Coromandel coast in what has become one of the most popular campaign settings for wargamers of the age of sail. Five actions, all largely inconclusive and fought between fleets that were relatively equal in numbers, were fought on the Coromandel Coast, at Sadras, Providien, Cuddalore, Negapatam and Trincomalee.
If you’re into post apocalyptic games such as Gaslands or Battlecars, you may find this guide to scratch building weapons for 1/64 battlecars useful.