Screen Saver

From: http://www.displaylink.com/support/tools.php#download

  DisplayLink have partnered with Actual Tools to bring you the best multiple monitor software on the market. 
 

From: http://www.displayfusion.com/Compare/

  DisplayFusion will make your multi-monitor life much easier. With powerful features like 
  Multi-Monitor Taskbars, TitleBar Buttons and fully customizable Functions, DisplayFusion 
  will make managing your multiple monitors easy. Take a look at some of the features below 
  to learn how DisplayFusion can help you!