I recently released the PDF of my super simple 1d6 OSR ruleset (https://www.drivethrurpg.com/product/324369/Ordure-Fantasy) but I also made a blogpost with the core rules and classes available so people could play for free, check it out here: https://lizardmandiaries.blogspot.com/2020/08/ordure-fantasy-1d6-osr-ruleset.html
The system is based heavily on my d6 Cyberpunk game “Shit Future” (http://lizardmandiaries.blogspot.com/2020/04/shit-future-d6-cyberpunk.html).
My goal was to make a fantasy OSR game as simple and easy to pick up as possible.