While "localhost:11501" isn't a single famous piece of software, it's often associated with or specific financial/government portal tools that run a background service on your machine.
In technical terms, is a hostname that refers to the computer you are currently using. It is used by developers to: What is localhost 3000? [closed] - Stack Overflow localhost11501 free
Some background managers for creative software suites use high-range ports like 11501 to sync data internally. localhost11501 free
: The most popular service for creating a secure tunnel to your localhost for testing. Localtunnel localhost11501 free