This is a group of stories related only in that they feature a superior replicator and an AI that is 7 billion years old, so it has a lot of experience to supply in solving problems. The first story in the series is "Paradise Found" and should be read first. The rest of the stories can be read in any order unless otherwise noted.
This story is the aftermath of the destruction of Earth's economic system by aliens. They gave us all a replicator. It did not take long for all economies to collapse, and humanity became a hell-hole of warring factions. This is the story of one teenage boy who led the way back to rationality. In the process, he became the nearest thing to God that a human could manage. 10 chapters.
This is an alternate reality. Jeff Culberson, a modern Massachusetts state trooper and his replicator, are somehow transported to west Texas of 1872 during the Indian War. He fights Comanches, weds his lady-love, spends some time as a town marshal and as a bounty hunter. He does a lot of good to make Texas a better place to live, including starting the first Normal school for women. 11 chapters.