Cairn is an adventure game about exploring a dark & mysterious Wood filled with strange folk, hidden treasure, and unspeakable monstrosities. Character generation is quick and random, classless, and relies on fictional advancement rather than through XP or level mechanics. It is based on Knave by Ben Milton and Into The Odd by Chris McDowall. The game was written by Yochai Gal. The full text is licensed under CC-BY-SA 4.0.
For more resources and the free PDF see https://cairnrpg.com.