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
In the developer section you will find the API, helpful for all Developers who like to create a Editor for the ProjectConceptor. But be aware: This API can change in the future!!
On this site you can also find:
the "offical" releases,
Tutorials,
FAQ and
really important news.
..... over at osdrawer
The source code is available at 
At osdrawer you also have the posibility to give feedback in the forum, log a bug or request a feature.
Thank you for your interest.