Modellus 4.5 for Mac is available as a free download on our software library. The program lies within Education Tools, more precisely Science. The actual developer of this free Mac application is Pedro Duque Vieira.
From the developer:
Modellus is a freely available application that enables students and teachers to use mathematics to create or explore models interactively. Modellus is used to introduce computational modeling for allowing an easy and intuitive creation of mathematical models using just standard mathematical notation, for creating animations with interactive objects that have mathematical properties expressed in the model, for allowing the exploration of multiple representations, and for permitting the analysis of experimental data in the form of images, animations, charts, and tables.
You may want to check out more Mac applications, such as sciatrope, Integrated Data Viewer Installer or HYPHY, which might be similar to Modellus.