Software > OBS Studio >
https://github.com/cg2121/obs-advanced-timer
I use this as a countdown timer to a specific time.
In order to have multiple timers, I had to make duplicates of the .lua script, give them new names, and load them all as separate scripts. Then I could configure each one to update its own text source.
I then used the text sources as per usual (in different scenes, etc)
