ScreenTask!

    https://raw2.github.com/EslaMx7/ScreenTask/master/ScreenTask/ScreenTaskMain.png

List of features:

  1. Share Your Screen Inside a Network Without Internet Connection (No TeamViewer Anymore)
  2. WebUI So Clients Doesn't Need Any Additional Software (Only Web Browser)
  3. Make Your Session Private Using Basic Authentication (User::Password)
  4. Unlimited Number Of Connected Clients 
Cross-Platform Version for ( Linux - OSX ) Written in Java : Download Page