MS XML Notepad 2007 <BR><BR>edit: just to clarify, this is an xml file editor that has a tree view pane on the left. You can right click and expand the whole tree, or leave it collapsed.

01-27-2015 DESIGN The Medieval Roots Of The Tree Diagram Data viz isn’t just a modern-day craze. Designer Manuel Lima, author of The Book of Trees, discusses the origins of the tree diagram.

The problem of limitations is especially true for tree diagrams that don’t resemble trees – and fewer and fewer do. Lima’s guidance is sadly absent where it’s needed most.