VncThumbnailViewer gives you the ability to connect to and watch multiple computers at the same time using the VNC protocol. It presents live thumbnail views of many computers in a single window, scaling and rescaling the views to best fit. Double-clicking on a single thumbnail will allow you to enlarge it and take control of that computer's keyboard and mouse.
Version 1.4.2: Fixed some bugs.
Mac OS X 10.4 or later