Monsoon is a fast and flexible HTTP enumerator that can be used for a wide variety of actions ranging from content discovery to credential bruteforcing. It allows you to execute a large number of HTTP requests, filter the responses and display them in real-time. You can use it to send HTTP GET requests for each entry in a file, ignoring all responses with a status code of 404. It is a single statically linked binary, so you can simply download a pre-built binary for your operating system from the releases page. Alternatively, you can build it from source by cloning the repository and running the command `go build`. It can be used on other operating systems such as Windows by setting the `GOOS` environment variable.