Разработчик UML-моделей - UML Modeller
[ О приложении ]

Umbrello is a Unified Modelling Language (UML) modelling tool and code generator.
It can create diagrams of software and other systems in the industry-standard UML format, and can also generate code from UML diagrams in a variety of programming languages.

Features:

• Supported formats: XMI

• Several type of diagrams supported: use case, class, sequence, communication, state, activity, component, deployment, entity relationship

Источник
Репозиторий: flathub

FlatPak: Umbrello [Developer Tools]