If you ever needed to share your screen while on the phone to somebody but don’t want the hassle of setting up a GoToMeeting, Teamviewer or Webex then check out Screenleap.
Screenleap allows you to share your screen without any sign-in or sign up. Just visit the site and select “Share your screen now”. (Java required) All that is left then is to get the code to the person (or persons) that you would like to be able to view your screen
Very good article regarding screenleap screen sharing tool. Additionally, on premise RHUB appliances is another very good option in order to have desktop screen sharing, web conferencing, webinars, online meetings, online presentations etc.