CircuitLogix - CircuitLogix electronics lab simulation provides fast, powerful schematic design and simulation in one complete program.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
FreeCAD - An open-source parametric 3D modeler
Multisim - Multisim is industry standard SPICE simulation and circuit design software for analog, digital, and power electronics in education and research.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming