The Quiet Year is a map game. You define the struggles of a post-apocalyptic community, and attempt to build something good within their quiet year. Every decision and every action is set against a backdrop of dwindling time and rising concern.
The game is played using a deck of cards – each of the 52 cards corresponds to a week during the quiet year. Each card triggers certain events – bringing bad news, good omens, project delays and sudden changes in luck. At the end of the quiet year, the Frost Shepherds will come, ending the game.
Check out the site here! You will notice that the game is not actually free. Buried Without Ceremony, the publisher, has a program called "Paying With Good Deeds". Basically, they will send you a PDF of any of their games for a number of good deeds. The Quiet Year PDF can be yours for about an hour of volunteer work, donating food or clothing, or cleaning up a local park. More publishers should offer programs like this.