Conceptual Diagramming
- Umbrello (KDE based UML editor for C++ source code) (cvs) (cvs)
- KlassModeler (wxWidgets based UML editor for C++ source code)
- Kivio (KDE based general-purpose diagramming tool with python support. Inactive project.)
- Dia (GNOME based vector general-purpose drawing tool) (lxr) (ml)
- DRT ("Design Recovery Tool". Tool to record and visualize the use of interactive graphical applications in X)