Kindle BooksWarning: Kindle free books rotate in and out constantly - daily, sometimes even hourly. You could see a book on a free list that was taken off free before the free book page was ever even published. Whenever you're given a link to a free Kindle Book, MAKE SURE It's free before clicking "Buy". Once you press the "Buy" if you have one click turned on, you just paid for it.PrepforSHTF - My favorite - updated often - not usually any pay books, though there was one on the day of this writing.
http://prepforshtf.com/free-kindle-books-limited-time-offers/#.Vfh95Zfk3JNPrepperology - Not refreshed quite as often (More pay books at checkout), and they include things like art and literature you may or may not wish to archive.
http://prepperology.net/free-ebooks/ (Abandoned? None of the books were free)
This one is automated, based on searches, but yields some fantastic titles. Since because of Kindle Unlimited, some showing up as free are actually pay if you just want to have them outright, just be cognizant og that - there's even a section on the site overviewing that before you get to the list
http://www.geekprepper.org/free-kindle-books/Amazon top 100 Free Kindle Books in Sports and Outdoors. About half are applicable. All should be free at checkout since it's Amazon's list
http://www.amazon.com/Best-Sellers-Kindle-Store-Sports-Outdoors/zgbs/digital-text/159818011/ref=zg_bs_nav_kstore_2_154606011?_encoding=UTF8&tf=1#1Amazon Top Free Kindle Books in Gardening and Horticulture
http://www.amazon.com/Best-Sellers-Kindle-Store-Gardening-Horticulture/zgbs/digital-text/156828011/ref=zg_bs_fvp_p_f_156828011?_encoding=UTF8&tf=1Amazon Top Free Kindle Books in Medical (Lot of weight loss, crash diets, quckery, etc - with some gems mixed in)
http://www.amazon.com/Best-Sellers-Kindle-Store-Medical-eBooks/zgbs/digital-text/157119011/ref=zg_bs_fvp_p_f_157119011?_encoding=UTF8&tf=1Another free book source. This one courtesy of my friend Allison
https://www.ereaderiq.com/ It's not exclusively prepper oriented, and not entirely free, but you can do searches. I found about a dozen books doing a search on homestead and setting max price to $0
Other:alpha411 100 Free Survival Downloads:
http://alpha411.blogspot.ca/2012/11/100-free-survival-downloads.htmlReady4itall Free Prepper's Library:
http://ready4itall.org/the-free-preppers-library/Preppers Info Free E-Books to Download:
http://www.preppers.info/Free_Downloads.htmlPreparedness Advice Blog Free Manuals to Download, Military Manuals and Books on Knots:
http://preparednessadvice.com/books/free-manuals-download-military-manuals-books-knots/#.VfiHL5fk3JPPrepper Website ebooks:
http://www.prepperwebsite.com/tag/ebooks/Survivor Library:
http://www.survivorlibrary.com/?page_id=1014Survival School Library:
http://www.survivalschool.us/survival-info/survival-manuals-pdfs/500 Free US Military Manuals:
http://www.survivalschool.us/survival-info/survival-manuals-pdfs/Pole Shift Survival:
http://www.pssurvival.com/PS/index.htmAdd yours! And if you don't have any objection, I'll add them in to the top post to keep a comprehensive list.