Touch Bar Timer is a little stopwatch for your Mac’s touch bar.
Tap to start/stop
Double-tap to reset
Hold to open the app preferences
More background: https://www.alexzirbel.com/touch-bar-timer
It's also open source! Thanks to Pixel Point, whose "Mute Me" app was the starting point for this project.
A Pomodoro feature & a timer will make this an ultimate productivity tool for the Touch Bar.
It's simple and easy to use. Takes up zero presence on "main" desktop and is a true touchbar only app.