I am not personally using these all-in-one solutions, but Casa OS has been posted frequently in this sub; Cosmos Server seems to have many more features than that.

There's a new novel, "How it Unfolds" by James SA Corey, which is unrelated to The Expanse.

It looks like it's part of an Amazon exclusive book series "The Far Reaches". I hope it'll be available by other means in the future.