Kelvin Green’s blog has a terrific visual D&D loot chart at the blog.
Jungle Ashanti Wars Rules
Jungle is a set of free wargames rules for the Ashanti Wars.
Pocket Imperium Free Card Game
Pocket Imperium is a free card game of the Expand, Explore, Exploit and Exterminate genre. It’s designed for three players (not many of these) and uses just 18! cards.
Breaking of Nations Universal Rules
Breaking of Nations is a set of free wargames rules for 25mm skirmish actions. Originally meant to be for the first World War, the can be used in a variety of settings. There is also a colonial variant.