Qlock

Qlock is a world clock that can show the time for multiple locations in the world right on your desktop.

Using small dockable windows for each configured city, Qlock comprises plenty of configuration options that are aimed not only at the overall appearance of the app, but also at the built-in features.

For example, a simple right click on any of the displayed windows lets you change colors, dimensions, format and transparency. Unfortunately, you can't adjust transparency by choosing your very own level, as you have to pick one of the predefined values.

Setting up a new city is a breeze because Qlock comprises a very large database of locations around the world, so it's enough to simply browse to the target city by choosing the country.

One of the drawbacks however is that Qlock doesn't come with a built-in search utility, which means that you can't simply type in the name of the city you wish to add.

Time synchronization is also available, which is quite an important feature given the fact that you can set the program to update time settings and sync with a time server at a defined interval.

Other than that, Qlock can be configured to connect to the Internet using the standard settings or set up a proxy server via a dedicated screen.

On the good side, the program works smoothly on all Windows versions and doesn't hamper system performance, remaining light on hardware resources all the time.

Overall, Qlock is indeed one of the best world clocks for your desktop, offering not only a highly-customizable interface, but also plenty of configuration options and easy-to-use tools.