Bards and Sages Publishing, publishers of Bards and Sages Quarterly and many other titles, is participating in the sale. Nearly all of their titles are on sale for at least 50% off. Many of the back issues of Bards and Sages Quarterly are free. Because there are so many, I'll just link to the publisher's page.
https://www.smashwords.com/profile/view/bardsandsages