The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Scout allows you to browse bonjour services on the local network. It then lists the clients advertising the service. If you select a client it will show the client's hostname, port, type, domain, and all TXT records. The application is great for network admin's as it allows them to check if their servers are advertising bonjour services properly. It is also great for reverse engineering network protocols.