At the time of this writing, the following cookbooks are currently free at Amazon.com.
I am not vouching for the quality of the cookbooks. All these cookbooks are for the Amazon Kindle eReader.
It is also possible that the price can change from free at any time.
I am just giving everyone a bunch of options for their low carb, Paleo, and/or gluten free kitchens. If you like any of these cookbooks, let us know in the comments below.