CODESYS - CODESYS - the IEC 61131-3 programming system.
FreeCAD - An open-source parametric 3D modeler
CX-One - CX-One software allows users to build, configure and program a host of devices such as PLCs, HMIs and motion-control systems and networks using just one software package with one installation and license number.
SketchUp - 3D for Everyone
RobotStudio - RobotStudio increase the profitability of your robot system by letting you perform tasks such as training, programming, and optimization
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.