Diagramr is a Website that allows you to draw diagrams by simply typing in sentences. The following diagram was created by typing:
Leibniz influenced Kant
Leibniz influenced Wolff
Leibniz influenced Baumgarten
Wolff influenced Baumgarten
Woff influenced Kant
Baumgarten influenced Kant
There are some ways to modify the resulting diagram, you can drag it into your desktop applications or reference it and include it in your Website, but I think the diagrams cannot be too elaborate, i.e. not much more elaborate of what you see here. Interesting idea, though.
I'd wish there was a desktop application like this.
1. See also the earlier post on yUml.