Five Tor.com Originals are on the list of this years' Hugo Award nominees in various categories. And to celebrate this they give away free versions of those five stories.
Wakulla Springs by Andy Duncan and Ellen Klages is nominated for best Novella and is available for free on amazon.com (and other countries!), Barnes & Noble and iTunes.
Equoid by Charles Stross is also nominated for best Novella and free on all three websites (amazon not only .com!).
The Lady Astronaut of Mars written by Mary Robinette Kowal is the only Tor.com Original entry for the category best novelette. So far you can only get it for free on Barnes & Noble and iTunes.
The Ink Readers of Doi Saket by Thomas Olde Heuvelt is a nominee for best short story and is available for free on Barnes & Noble and iTunes.
The Water That Falls on You from Nowhere by John Chu can also be found in the category short story and is available on all three websites amazon.com (and other countries!), Barnes & Noble and iTunes.
Check out their homepage to find out more about it!
And if you want to know which novels, novellas, novelettes and short stories are nominated this year, Tor.com has an article with the whole list too.
Small update: If you don't want to download any ebooks, you can also read those stories online at tor.com!