A nice freebie for spanish-speaking (spanish-reading?) sci-fi genre enthusiasts. Of course, you can still browse it, enjoy the art and get inspiration even if you can't read spanish.
https://grapasymapas.com/cosmophobia
"A role playing game themed on Sci-Fi and corpoorate horror"
Edit: There's another Sci-Fi game in the same site, but with less horror, called Vieja Estrella:
https://grapasymapas.com/viejaestrella
The whole site is devoted to providing free RPG stuff in Spanish in a very English-dominant hobby (though they also have their fantasy offering in Galician, French, Basque, Portuguese, and Catalan). Most of their stuff has very simple mechanics and a very old-school vibe.
