Risky Settlers of Catan is a Settlers-Risk mash up. The author writes:
It’s basic Catan rules plus armies! With your soldiers that you produce based on number of settlements/cities, hexes controlled, and intersections controlled, you can: -Control hexes for either resource or troop production bonuses -block opponents’ development and expansion -attack and seize opponents’ hexes and settlements.
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Skirmish is a free print-and-play card game of Dark Ages combat, inspired by Atlas Games’ Lunch Money.
Nighthawks is a free print-and-play game of space combat. Remarkably, each player needs just 16 cards.
There’s a very interesting thread over in the Redditt board games forum. The question was “What are your favorite games that take five minutes to set up and five minutes to explain.”
It’s a very interesting list, and there are quite a few games there I’ve never considered. My group often finishes one game early and is looking for another to finish out the night. There’s a good many here for thought.