A Pluggable Authentication Module (PAM) which allows the establishment of alternate passwords that can be used to perform actions to clear sensitive data, notify IT/Security staff, close off sensitive network connections, etc if a user is coerced into giving a threat actor a password.

Someone made up stickers that you can download, print, and put on all of your laptops over the hard drives in case you ever feel the need to run a power drill through them.

Some useful suggestions for bloggers who are also politically or socially active, i.e., a likely target of (secret) police because of their opinions or social connections. In short, develop a contingency plan in the event that you are captured, hospitalized, or killed that lets trusted associates act in your stead on your website. I've looked over this article and they recommend a large number of things that I also have built into my dead man's switches, so I recommend it.