The only things I’ve found were impractical objects, or apps that cost $10-50 per month because they’re designed for consultants who bill their time. Apps are not accurate while one is in meetings, since the computer is off.
The thing is, even for consultants, they get no value from a red “Busy” gadget, but having an object on the table which you can punch to set on which client you’re working, would certainly be useful. More fun than an app, because sometimes you need physical objects.
I’d just like to clock in and clock out.