Can we count Processing as Environment for Mathematical Modelling and Programming?
From the link you provided: Processing is an open source programming language and environment for people who want to program images, animation, and interactions. That’s not inclusive of everything that I’d call mathematical modeling. When I hear that term, I think of linear algebra representations of physics problems in solid and fluid mechanics, electromagnetics, and heat transfer. I doubt that Processing can do all that without a great deal of effort, but I’ll admit that I didn’t pore over the docs to ascertain that fact. I would not call Eclipse an “Environment for Mathematical Modelling and Programming”, unless you write a plug-in and framework for such things. It’s an IDE for Java.