Tiny features are often best. One of the most often used utilities on my computer desktop is a small program that tells me EXACTLY what time it is (wisely reckoning weird shifts in daylight savings time) anywhere in the world. I don’t know how people who conduct global business or world-wide travel manage without it. This little gem (which used to be called World Clock) can also give distances between places, real time sunrises/sunsets, moonrises, and so on for any place on earth. It’s for Macs only. You can download a free miniature size version to try it out.
$35 full registration
$15 “lite” registration