Last time there was a bundle like this (https://news.ycombinator.com/item?id=14791255) dsacco wrote an awesome comment with recommendations on which books to pick up. Any chance for another round?
Book of PF & Absolute OpenBSD are somewhat essential if you have interest in OpenBSD, but the latter is skippable if you're a seasoned neckbeard/sysadmin.
I can't really say anything else about the lower tier books, but the 35% off coupon is quite nice.
So to anyone else buying the bundle primarily for the books on OpenBSD, and who happen to support FreeBSD also:
1. Log in or create an account.
2. Go to https://www.humblebundle.com/store/select-charity/charity/21... and select it as your chosen charity to support.
3. When you go to pay for the books adjust the sliders so that you give some percentage (I chose 100%) to charity and under charity adjust the slider for The FreeBSD Foundation (once again I chose 100%).
Deal? Deal!
I would actually say maybe/maybe-not for the other book. MWL writes great stuff but the book is sort of specific to OpenBSD (and even a little bit outdated then: sudo vs doas). You could probably get the same out of deep reading of man pages. If you don't know your way around man or BSD init yet, then yes, pick it up.