TFATagger
Adds {{Current TFA}} to the bottom of Wikipedia:Today's featured article at 00:00 UTC, and removes it the following midnight. This makes it possible to target TFA in edit filters.
DisabledTo enable, set /Run to true (link)
Errors are logged at /Error log
The name of the template that is added can be configured at /Template. It is currently set to Template:Current TFA.