* [Apollon v4.5.0](https://github.com/ls1intum/Apollon) – Web-based UML modeling editor supporting 13 diagram types, real-time collaboration, and export to SVG/PNG/PDF/JSON.

* [State Machine cat v15.0.4](https://github.com/sverweij/state-machine-cat) – Text-based tool for creating visually appealing state charts without drag and drop or complex layout tools.