Little or even unknown website that you like to use?

What little-known sites or services have you used? We often come across little tools on the Internet that are sometimes not even known but that somehow solve problems or are a good way of distracting us. I'd like to get to know some of yours, maybe I'll use them too. One of the ones I've been using the most lately is: [https://liveuamap.com/](https://liveuamap.com/) Here we can see the current front lines of the war in Ukraine/Russia.