Konzept is a small classdiagram editor. Major design goal was usability. The project was inspired by the static diagram editor of the Toolkit of Conceptual Modelling. Konzept is a pure Qt application written in Python.
K3Studio is the universal workbench for 2d/3d modeling, visualization and simulation.
The main topic is simulation and visualization of automata networks, but it can be used for diagram drawing, flowcharting, presentation, as a CAD, GIS,...