PowerMill - PowerMill is an advanced CAM software that comes with a flexible way to get done with your complex high-speed and five-axis machining processing.
FreeCAD - An open-source parametric 3D modeler
Inventor CAM - Inventor CAM is one of the agile, integrated CAM software, aiding out users to streamline their manufacturing process having rich functionalities and features in place.
SketchUp - 3D for Everyone
MeshCAM - MeshCAM is the fastest way to generate gcode
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.