The Rogues Manual    by Katie Gatto
Price: Free! 5960 words. Published on September 5, 2011. .
This is the players handbook and the Storytellers guide for the Disparity role playing game.

Critical Failures    by Robert Bevan
Price: $4.99 USD. 84520 words. Published on June 4, 2012. .
Four friends are transported into a fantasy game world at the whim of a sadistic game master.

My Guide to RPG Storytelling    by Aron Christensen
Price: $0.99 USD. 40540 words. Published by llstories on October 27, 2012. .
At the request of his players, Aron has written this guide to his method of RPG storytelling. This guide includes suggestions on how to prepare a campaign, running each session, dealing with problem players, how to create memorable NPCs and more.