Hi!
Laboratory of Systemic Modeling (http://lamswww.epfl.ch/) is developing and maintaining SeamCAD - a CAD tool specifically developed for modeling hierarchical systems in Enterprise Architecture. As the tool is increasingly used in our research, teaching and diploma/semester projects, it would be great if people can post their comments and share their exprience while using or contributing to this tool.
You can learn more about the tool at http://seamcad.epfl.ch
Feel free to write your blogs about SeamCAD!