The library that I make, GoJS (http://www.gojs.net/ http://www.gojs.net/) has a tree layout and layered digraph layout, both with many options. Here's an over

The library that I make, GoJS (http://www.gojs.net/ http://www.gojs.net/) has a tree layout and layered digraph layout, both with many options. Here's an overview of the options for the layered digraph layout: http://www.gojs.net/latest/samples/ldLayout.html http://www.gojs.net/latest/samples/ldLayout.html The tree layout supports some fairly complicated tree structures, including ones that alternate or have different configurations for leaves: http://www.gojs.net/latest/samples/tLayout.html http://www.gojs.net/latest/samples/tLayout.html Disclosure: I'm a developer of this library and it is not free.