I didn't know about it existence, it looks like a nice project! Also, it would probably play nicely with Nix (by writing wrappers instead of symlinks)

However it doesn't fit quite the same niche that my tool does. If I understand it correctly (though I only read those two links) fnox is more about how to use the secrets, ie given an encrypted description of the secrets, how to make them accessible to programs (kind of like sops?)

With my tool, secrets on the device are in plaintex and simply accessed by path reference by the respective programs. The focus of secs-man is more on exporting, ensuring integrity, and importing (possibly to remote machines). All of this, while being manually recoverable even without the tool.

Still, interesting project! Might take inspiration from it for some features