ProjectConceptor

ProjectConceptor is a modular application to view, edit and process information which can be represented by a graph structure. So developers can used it to help design their applications, showing how structures and layers interact. End users can plan and illustrate dependencies on projects, brainstorm and show organisation structures.

We know that it runs on  Haiku and it should also compile on god old BeOS R5.

..... On ProjectConceptor.de