For sometime I used several of the URL shortening services, while useful I rarely used them for a long lasting web link. Most will charge you for a mnemonic redirection and there's always the lack of control of the hosting, analytics and so on.
So I decided to write my own and Birr was created. It is a very simple redirection code written in Python which takes a configuration file and redirects a URL into another. Check it out in https://mvaltas.com/birr.