- https://sysml.org/
- https://wi.uni-potsdam.de/homepage/lehrewi.nsf/0/864b1102a89b4f0bc1258114006fabc0/$FILE/8%20-%20Aufnahme%20und%20Visualisierung%20von%20IT-Landschaften.key.002.pdf/8%20-%20Aufnahme%20und%20Visualisierung%20von%20IT-Landschaften.key.pdf
- https://www.edv-buchversand.de/chapter.php?cnt=getchapter&id=ha-41328.pdf
- https://umbrello.kde.org/
- https://staruml.io/ (commercial but inexpensive)
- https://github.com/ModelioOpenSource/Modelio (eclipse based, partly commercial, UML2, Archimate, BPMN2)
- https://www.archimatetool.com/ (eclipse based, Archimate)
- http://www.umldesigner.org/ (eclipse sirius based, UML2)
- https://www.eclipse.org/papyrus/ (eclipse based, UML2, SysML, BPMN, Archimate, ...)
- https://www.eclipse.org/atl/ (eclipse based, model transformer)
- sparx commercial
- https://www.umlet.com/ (wiki style)
- https://plantuml.com/de/ (ascii -> diagram with automatic layout)
- https://plantuml.com/de/running integrations with other programs
- https://crashedmind.github.io/PlantUMLHitchhikersGuide/
- layout tips and tricks
- comments in plantuml
- smetana layout engine
- elk (eclipse) layout engine
- vizjs layout engine
- non-uml diagrams
- C4-PlantUML fork for C4model support
- https://kroki.io/#support (very many diagram types, including plantuml and c4 support)
- https://github.com/prmr/JetUML
- https://github.com/argouml-tigris-org/argouml
- class diagrams with idea
- https://gaphor.org/ (eclipse based)
- https://github.com/bpmn-io/bpmn-js (view and edit)