I’m one of the first to subscribe to several book lists that let me know about free or discounted Kindle books. In addition, to read voraciously, I subscribe to one or more of the following resources. Others may want to leverage these e-zines for their reading enjoyment and/or analysis of what other writers are doing through flash fiction, short stories or novellas.
http://www.quantummuse.com/ : Quantum Muse – speculative fiction e-zine that has been going on for a number of years and is a free subscription.
http://www.darkfictionmagazine.co.uk/ : Dark Fiction – no longer producing new content since 2013, but sixteen issues/episodes of reading and audio stories.
http://clarkesworldmagazine.com/ : ClarkesWorld – Hugo Award winning speculative fiction e-zine. I’ve also seen print copies and Kindle copies available for sale on Amazon.
http://www.plotswithguns.com/ : Plots with Guns – No longer providing new issues, but click on the Archives section for some free mystery short stories.
http://www.shotsmag.co.uk/default.aspx : Shots – Crime and Thriller EZine – I’ve not necessarily found much on free stories, but lots of good articles on the craft of writing mystery fiction.
Also, many of the paid magazines (Asimov, Ellery Queen, etc.) have online versions if someone wanted to pay for those resources.
Hopefully this short list of story / article resources will help keep people reading in between writing. Keep on writing!