AQUASIM - In order to support environmental scientists in finding an «adequate» model of the system...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
STOAT - STOAT - a dynamic sewage treatment works modelling package
FreeCAD - An open-source parametric 3D modeler
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
DWSIM - DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows and Linux.