MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming