Nothing native - you either have to use the Google API's, or if you're feeling a little adventurous then you can generate the HTML and style it manually - that gives you the greatest level of flexibility but it's a lot more involved. Basically you use nested HTML list objects and style the :before and :after selectors by moving them up to the top of the element and applying borders to those. I.e.

So the both have a top border but only the before has a right border. Then for the first elements you remove the first top border and for the last element you remove the after top border. Sounds complicated but you can get some very nice results from it. Here is one I wrote that generates a chart manually in APEX. Displays the first level horizontally and the remainder vertical. Cells colour coded and names clickable (to drill to detail), with the nodes collapsible too. We append metrics at the bottom as final nodes (the circular cells). The org chart is 100% html/css with the drilldown and node collapse done via jQuery