Unity - The multiplatform game creation tools for everyone.
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.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.