Are available from some of the best established and upcoming writers in the speculative fiction (SF/F/H) genre at: http://chainstory.stormwolf.com/
I'm not sure how long these stories will be available for free, so grab a cup of coffee and visit soon!
My CP, David Benz, is participating in this project, and his short story is amazing! Be sure to check out his title, THE CANONICAL EFFECT, a story that will have you wondering about the true identity of Jack the Ripper. Here's the direct link to David's site:
Click on 'stories' at the bottom of the page to download in a pdf doc.