Kutt is a modern open-source url-shortener. You can create, protect and delete your links and monitor them with detailed statistics.
Simply go to due.ren and create an account to start shortening your links.
You can password protect links, have them expire and automatically generate a qr code for easy sharing.
You can also use the provided API to create, delete, and get URLs from anywhere. There are browser extensions available:
Let me know if you would like to use a custom domain and I can set it up for you.