Mastercam - Mastercam's Dynamic Milling is a game changer for us.
FreeCAD - An open-source parametric 3D modeler
Autodesk Fusion 360 - Integrated CAD, CAM, and CAE featuring collaborative editing and cloud-based computation.
SketchUp - 3D for Everyone
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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.