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.
Multiuserstopwatch.com is a free web aplication to measure time by many users joined in the same session. It works like a multiplayer application where different users log in to the same session and they can operate (start,stop, measure split times) the session stopwatch from diferent devices/paces.
Since its conception in 2014, Chronograph.io has been allowing users around the world to share live timers and stopwatches. Start a marathon from one phone; end it from another miles away. Have each team member reset the scrum clock. All is possible.