MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
EMSO simulator - EMSO simulator is an equation-oriented process simulator with a graphical interface for modeling...
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
StochSD - StochSD (Stochastic System Dynamics) is a Continuous System Simulation extension that is built with the capabilities to help you simulate continuous flows between compartments and, most importantly, also has the power to manage discrete transitions …
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.