PCB123 v. 5.1.0 free PCB design tool includes new edit panels with several user preference options, drag-and-drop functionality for parts, and smoother rendering performance. Includes a change in uniformity between control panels for layout and schematic views. Parts from libraries can be added from the layout using a new tab in the edit panel. Zooming and panning designs with polygons is reportedly more responsive. Can pan and zoom in layout by holding down right mouse button and moving mouse or scrolling mouse wheel. Display Tab for layout view has been reworked. Edit controls have been configured. Panes are resizable horizontally and vertically. Tooltips on controls teach user what is useful about the feature. In Layer Display pane, a scrollbar has been added for designing many layers. Color visibility selection on Layout Appearance pane is identical to Layer Display.
Sunstone Circuits, http://www.sunstone.com/PCB123.aspx