About Go
Go makes connecting to servers faster and easier. No matter what protocol you use, Go puts terminal sessions, web apps, ftp, sftp, and a host of other types of connections only a click away. You don’t have to stop to think about what application you need to open to perform a task, Go takes care of that for you. Go can also let you know if it can connect to a server at a glance, with real-time up to date connection status information shown in the green or red gems.

Read more: http://www.apple.com/downloads/macosx/networking_security/go.html