Searching on the name led me to a site with some other, older diagramming systems. The photo here shows Genesis 1:1 diagrammed by the Clark method. (Do we need to add support for this?)
The next release of Logos Bible Software will support flowing columns of text with user-adjustable margins and tabs. It is hard to explain but easy to use, and it is designed to support the outlining / phrasing / aligning / arcing advocated in some recent guides to exegesis. (These diagrams still support the line drawing objects, allowing you to mix shapes and flowing text.)
We are calling these “sentence flow diagrams,” after Gordon Fee’s description in New Testament Exegesis. But if you know a better or more accurate name, let us know!