Timeline Skirmish Rules are a set of free wargames rules for skirmishes set in nearly any time period.
Amazon Deals On Games
Amazon’s first day of their Twelve Days of Deals features a lot of games. Lots of stuff for Imperial Assault, X-Wing, Descent, Zombicide, plus board games like Dominion, Potion Explosion, Terra Mystica, Letters from Whitechapel, Suburbia, Smash Up, and on and on.
All at the link are at least 25% off as of this writing.
Strike Force One
Strike Force One is designed as an introduction to the hex and counter genre of board game.
Law of the Gun Wild West Rules
Law of the Gun is a set of free wargames rules by Richard Bradley for Wild West Skirmishes.