Kitchen Timer from Tropical Software is a utility that, honestly, I never use. However, my wife finds this timer for cooking-related tasks, helpful.
Yours Truly simply sets the Timer on the Clock app on my iPhone 6 Plus when I need to time something. However, my wife uses Kitchen Timer on her MacBook Pro when preparing food for the family.
The simple, $2.99 tool is a software representation of the old-fashioned mechanical Kitchen Timer. You can set multiple overlapping timers, which is handy you're preparing multiple dishes.
Of course, you can use it for other tasks besides kitchen duties. You can set up a reminder to take medicine, make a phone call, take a break, and more.
Some folks won't need Kitchen Timer. However, if you want an inexpensive, easy-to-use, flexible timing app for your Mac, Tropical Software has cooked up the app for you.
Kitchen Timer requires Mac OS X 10.5 or later. $2.99. It's available at the Mac App Store, as well as the Tropical Software website.