Stumbled onto this site, purely by accident, only to be highly entertained by its collection of retro-themed science fiction. Besides the generator, there’s some choose-your-own-adventure books in the ’30s pulp sf vein, which is the main focus of the site. It’s free, being funded by donations and purchases at their store. Great visuals, great theme, entertaining find.
My favorite results from the generator include “Robot that Caged the Swamp,” obviously an environmental morality play, “Twilight of the Streamlined Cat,” which just sounds intriguing, and “The Electrical Death Ray of History,” which is a greater threat for those who forget history than being doomed to repeat it.