Free Speculative Fiction Online 
This list is limited to the Hugo Awards, the Nebula Awards, and the World Fantasy Awards. See here for further awards.
(Clarkesworld #36, September 2009)
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(Tor.com, September 2016)
Isfdb:
(Scattered, Covered, Smothered Anthology, 2005)
(Strange Horizons, August 2005). Isfdb:
(Fishnet, April 2005).
(Helix #3, Winter 2007). Isfdb:
(Strange Horizons, December 2007)
(Jim Baen's Universe, August 2008)
(Postscripts #22/23, September 2010). 
Isfdb:
(Clarkesworld #50, November 2010). Isfdb:
(Weird Tales, Spring 2011)
(Steam-Powered Anthology, 2011)
(After Anthology, 2012).
(Lightspeed, June 2014) Isfdb:
(Clarkesworld #94, July 2014). Isfdb:
(Wired, January 2017)
(Uncanny Magazine #18, September 2017) Isfdb:
(How Long 'til Black Future Month? Collection, 2018)
(A People's Future of the United States Anthology, 2019)