NotificationWatcher
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Doesn't work since at least Catalina
I know this project is unmaintained, but I figured I'd mention this for future on-lookers.
I tried this on Catalina and Monterey (I don't have access to a Big Sur installation, but I assume it won't work either), and the distributed notification center area remains blank. The NSWorkspace notifications do still show up.
More info: NSDistributedNotificationCenter No Longer Supports nil Names
Oh, and I did try also running as root (with the App Sandbox and Hardened Runtime both disabled)
I haven't tried running this app for many years. I can't say I'm surprised that they removed the ability to use nil for distributed notifications. It did always seem surprising that they supported it.