I came across this really useful site some months back and I use it all the time https://www.bookbub.com/
BookBub alerts you to limited-time free & discounted ebooks matching your interests.
It's free to join, you can read on any device, and the books are yours to own.
How it works
You sign up with your email, select preferences in your account and each day it emails you with a list of special offers of the day. Not all are free, but usually each day there is at least one site that has a free book or two for download.
Follow Authors
Select Categories to be notified
You get an email each day with the list of deals, some of which are usually free and the link takes you to the offical site, amazon, apple, kobo etc. I find it really useful and I am building up my ebook collection for later reading.
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