Blender - Blender is the open source, cross platform suite of tools for 3D creation.
EPLAN Electric P8 - CAE software solution for project planning, documentation and administration of electrotechnical automation projects.
FreeCAD - An open-source parametric 3D modeler
AutoCAD Electrical - AutoCAD Electrical design software is electrical engineering software for electrical CAD.
Sculptris - Sculptris: Enter a world of digital art without barriers.
QElectroTech - QElectroTech is a free software to create electric diagrams.