Here are a set of houserules for Osprey Publishing's Frostgrave.
Full Command Fantasy Warfare is a set of free wargames rules for hex-based fantasy games.
Designed for medieval battles, Lion Rampant is one of Osprey Publishing's well-received rules sets. Landwasters and Raven Feeders is a set of modifications for the rules for the Dark Ages. I have a large number of Viking and Norman figures, so this is of great interest to me.
Osprey is supporting their popular Frostgrave rules with some paper model ruins for the game. They could of course also be used for a number of other medieval and fantasy games.
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At $20 for a copy of Splendor, I'm in.