Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
FreeCAD - An open-source parametric 3D modeler
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.