Konzept is a small class diagram 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.
A program for creating Unified Modelling Language (UML) diagrams of software.
The project web site is located at https://uml.sourceforge.io/
For reporting bugs, see https://bugs.kde.org/enter_bug.cgi?format=guided&product=umbrello
The development of this project is located at https://invent.kde.org/sdk/umbrello
Available in every Linux distro, on MacOSX and Windows.