Should one have the need to mass-download their Kindle books from Amazon without a ton of clicking around the Kindle Download Helper Python project looks to enable that.

I haven’t yet tried it, but it seems to work for other folk. Of course you’ll have to let it log in to your Amazon account which might be a deal-breaker for some, along with any risk associated with the fact that I can’t imagine it complies with Amazon’s terms of service. Although as it’s open source you can at least check in advance what the code is doing.