MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
GNU Octave - GNU Octave is a programming language for scientific computing.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.