An open-source UML modeling tool that has been around for years.

Simple one-time payment, use forever. No monthly or annual fees. One-time payment for each device, use it forever. No hidden fees, UML diagramming software which is free for students?

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Many universities have site licenses for UML tools. Check with your computer science department or IT service. They might already provide access to StarUML or another professional tool at no cost to you.

A simple, open-source modeling tool written in Python.