This is a few years after the fact, but here goes anyway, I've made a free TTRPG system - a tribute to Discworld, rules for adventuring on the disc: A one in a million chance at adventure - a Discworld tribute by Jocher Games
A One In A Million Chance at Adventure, 2nd edition - a D10 Roleplaying system for adventures set in the Discworld Universe
Welcome to the ranks of role-players and adventurers of the Disc. We are very happy to see yet another eager and curious young recruit!
What you have before you is the...