If your goal is to design parts and generate G-code for a milling machine, these programs are the industry standard for free downloads:
Highly recommended by DIY enthusiasts for its simplicity in turning 2D and 3D models into efficient toolpaths. Free 3D Models of Milling Machines Milling machine 3D Free Download
Best for absolute beginners. It is web-based (no installation required) and offers a free version for basic 2D and sign-making projects. If your goal is to design parts and
Widely considered the most complete free CAD/CAM environment. It supports 2.5-axis and 3-axis milling toolpaths, making it ideal for hobbyists who want professional-grade 3D design. Widely considered the most complete free CAD/CAM environment
A fully open-source parametric 3D software. It includes a "Path" workbench specifically for generating CNC G-code. While powerful, users often review it as having a steeper learning curve compared to commercial alternatives.