MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
GNU Octave - GNU Octave is a programming language for scientific computing.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
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.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.