You can see the list of the books here :
www.freefantasybook.com/
They are free today and tomorrow (6/20 to 6/21).
I don't know how good the books are but if you look at the Amazon listings you can check out the reader reviews there. I looked at a few of them and they all seemed to have 4+ stars. I noticed at least one book ( Gnome Wars) isn't coming up as free on Amazon so make sure you pay attention and verify they're $0 before buying.
If you don't own a Kindle then don't despair, can use one of Amazon's Free Reading Apps.
I heard about this on Fatwallet.
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