ProfiCAD is designed for drawing of electrical and electronic diagrams, schematics, control circuit diagrams and can also be used for pneumatics, hydraulics and other types of technical diagrams. It is a freeware diagram designing application that's professional, straightforward and reliable.
Here are some screenshots to illustrate the features and user interface of this application:
3D Object Converter
Autodesk Fusion 360
VariCAD Viewer
Sweet Home 3D
Blender