You download them directly from thr Humble bundle website. They appear to be DRM free.

They are all available in PDF but only some are available in all formats, and the rest are either only PDF and MOBI or PDF and ePUB, if that matters to you

I don’t know, I’d have to check the database. I add to it every once in a while so it keeps growing. I think I started with around 20 or so

I made a website for my wife with a list of a ton of reasons why I love her and each time she taps the screen it shows a new one.

So… that is a thing you can do for the cost of a domain name and some cheap hosting.