I set a friend as an emergency contact for my Bitwarden vault, so he can request access, and if I don’t deny it within 2 weeks he’s granted access.

I’m also working on a kind of digital dead man switch. Basically, I’ll make it so that you give it some last messages, which are assigned to groups of recipients. The service will send you an email at a specified interval (for example, every month) with a link in it. If you don’t click on the email a few times, you’re marked as dead and the last messages get sent out to their corresponding recipients.