I see that someone mentioned a post apocalyptic game...have any one you tried playing Aftermath! ? Character creation is a bit of a process and you actually have to keep really close track of your supplies, but the game is really fun. If I remember correctly I think it's mostly d20 based. In a campaign that I was in, I played a medic and an immune. At one point our group ran out of food and we all wouldn't survive the winter, so I ate everyone. Since I was an immune, i didnt go crazy or get sick