Gone Man’s Switch is a simple web application that allows you to create messages that will be delivered by email when you are absent (gone) for a certain period, AKA a dead man’s switch.
It is a free self-hosted alternative to deadmansswitch.net. It doesn’t have as many features, but it does the job.
More info in the GitHub repo: https://github.com/jhonderson/gone-man-switch
What could be great here is to have the possibility of a trusted third party to request “early release” - this could then prompt the user for acceptance or not with a shorter time frame. We would however need to make sure this is not abused