Some things should only happen after you can't do them yourself.

Posthumous is a federated dead man's switch. You check in via phone, browser, or API. If you stop, it triggers pre-configured actions: send emails, publish files, rotate secrets. Self-hosted, no central authority.

https://metafunctor.com/post/2026-02-14-posthumous/

Posthumous: A Federated Dead Man's Switch

A walkthrough of Posthumous, a self-hosted dead man's switch that monitors periodic check-ins via TOTP, progresses through escalating alert stages, and triggers automated actions if you stop responding.

metafunctor