Start a timer in seconds, try the Pomodoro technique or just looking for a (world)clock in your menu bar?

Check out these Mac Menu Bar Time Apps:

Collection:
Paid apps

Clockey

clockey

Clockey lets you add the time from as many timezones as you want to your menu bar. Quickly access any time zone with one click.

Visit

Collection:
Paid apps

Timing

timing

Instead of making you start and stop timers, the menu bar app Timing automatically records which Mac apps, websites and documents you use.

Visit Watch

Collection:
Paid apps

TimeBars

TimeBars

Visualize daily, weekly, monthly, quarterly, or annual time intervals as a progress bar displayed across your menu bar.

Visit

Collection:
Paid apps

Howler Timer

howler-timer

Howler Timer is a nice option if you want the timer to pop out into a new window. It also allows you to play whatever sound file you want for the alarm.

Visit