The best possible score is 10.
No specific info about version 6.4. Please visit the main page of Multisheet Viewer on Software Informer.
Bentley View is a free DGN viewer, DWG viewer, and i-model viewer.
Phoenix Viewer is a viewer developed for usage in Second Life.
Secondary Viewer Photo Viewer is an image viewer on secondary display.
View & print sheets in a drawing created with the Electro Graphics' CAD products