Polr is a self-hosted, open-source URL shortener that offers a modern and minimalist approach to link management. With Polr, you can host your own URL shortener, customize your branding, and have full control over your data. It is built on PHP and powered by the Lumen microframework, using Blade templating and a clean MVC architecture. The flexible and robust API allows for seamless integration with other services. Polr's easy-to-use interface makes it simple to manage links and customize your instance. You can adjust permissions, redirects, and even the theme to fit your needs. Additionally, Polr offers a demo instance for testing purposes, where you can try out the API, interface, and admin panel. If you encounter any issues or have suggestions for improvement, you can contribute to the project by forking it on GitHub, joining the IRC channel, or adding issues and feature requests to the tracker. Overall, Polr provides a powerful and customizable solution for shortening URLs and managing links.