The "Open Multiple URLs at Once - Free Multi URL Opener Tool" is a web-based tool that allows users to quickly and easily open multiple URLs at the same time. By simply entering a list of URLs into the tool, users can avoid the time-consuming task of manually opening each URL in a new tab or window. This free tool is designed to streamline web browsing and improve efficiency, making it ideal for anyone who needs to open multiple web pages on a regular basis.