This is actually one of the few types of examples that I think fit here. Most of the other people are just posting their side projects. When I clicked this I was expecting some quick bash/batch/python/etc. scripts that do useful things.
Doesn't have much functional value, but it was easy to write (though over the years it needed some care, mostly thanks to closing weather APIs) and it is a small simple thing I use almost every day, as it is in my autostart.