MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming

draw.io - Online diagramming application

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.

OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.

Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.

yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.