I did a quick search, and didn't see this posted, but I have had fails in searching here before....
Each Monday, Kristine Kathryn Rusch offers a free short story of hers for our reading pleasure, and it is only available for one week. I have read quite a few of them over the last couple of years, and most of them are SFF. I have also thoroughly enjoyed 90% of them.
You can always go to her site to read the story each week, but there is an easier way. If you
subscribe , you will automagically get the current story delivered via RSS feed.
Note, she also sends other articles (not a lot, maybe 2 - 4 a week) about making a living writing. Most I just skip, but I read the occasional one, and to my untrained eye (never tried to make a living writing), what she says makes sense, and is fairly interesting. There may be a way to stop the "extra" articles, but I haven't tried since I sometimes read them. Actually, since the titles of the short stories all start with "Free Fiction Monday:", it would be simple to write a write a macro to delete any posts that don't start with these words.
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Oh, BTW, I actually drilled one of the very early (1988) experimental, very long (2500' plus horizontally) wells in far south Texas in the Austin chalk there. And at the end, we fracked it, although it was a relatively small job by today standards.