Agile Requirements Designer
Model-based test design tool deriving test cases from flowchart models
GraphWalker
Open source model-based testing tool
ArgoUML
Open source UML modeling tool written in Java
Papyrus
Open source model-based engineering tool based on UML and SysML
ibello
Test automation framework for web applications and back-end systems
AltWalker
Open source model-based testing framework for Python and .NET