The fantasy table top roleplaying game Tierras Quebradas counts with an interesting amount of free digital supplements. Now they are all available in itch.io! Tierras Quebradas is a fantasy RPG of Moorcockian inspiration published in Spanish by Ediciones T&T.
You can find the Tierras Quebradas’ Starting Guide: https://carlostq.itch.io/gua-de-inicio-de-tierras-quebradas
And the five numbers so far of the fanzine Intervención Divina.