On The Gauntlet Blog I present the 21st installment in my look at rpgs set in the aftermath of disasters (near and in the distant past). You see tons of settings: fantasy, modern, sci-fi. This one goes from Altais to Umerica.
You can see that here: https://www.gauntlet-rpg.com/blog/history-of-post-apocalyptic-rpgs-part-21-2017
It has links to all the previous installments as well as series covering Superhero, Steampunk/Victoriana, Horror, Cyberpunk, Universal Systems, Licensed Games, and more.