Most programs on Windows have an alternative available on the Mac with the notable exception of CAD/CAM programs; there are relatively few popular CAD/CAM programs that run on OSX.
The list below is a good starting point for Mac-friendly 3D CAD programs:
Best Free Cad Programs For Mac
Open Source 2D-CAD. LibreCAD is a free Open Source CAD application for Windows, Apple and Linux. Support and documentation are free from our large, dedicated community of users, contributors and developers. You, too, can also get involved! Different types of CAD software or computer aided design software are used in many jobs and industries. With the help of such programs, not only can. Magicavoxel is a free program, and you don’t need any commercial license to download it, and it is available on both Windows and Mac. It is a simple and user-friendly interface that will allow you to use it even if you are a beginner. We already covered the ten free CAD software for every type of platform. Here is another ten best CAD software for Mac that will run natively on the Mac OS X operating system. It is fully compatible with the Mac operating system, and no need to use any specific emulation software or a compatibility layer to uses this software. LibreCAD is a software business in the United States that publishes a software suite called LibreCAD. The LibreCAD product is Windows and Mac software. LibreCAD offers a free version. LibreCAD includes online support. LibreCAD is engineering software, and includes features such as 2d drawing and drafting.
OnShape
OnShape (Free - $80/Month)- OnShape is a new cloud-based CAD program from the same team that created Solidworks. It runs completely in the browser so it runs on PC, OS/X or even an iPad. There’s a range of pricing options and for many users, it’s totally free.
solidThinking
http://www.solidthinking.com/(Call them for pricing) solidThinking offers a number of CAD programs that seem to be very powerful. They seem to have a business model where you contact them for demos and pricing so they may only be an option if you’re really comitted to learning more about their products.
Via Cad
http://www.punchcad.com/($99) Via CAD is a very capable 2D/3D CAD program that uses a “real” CAD kernel and it capable of creating good parts for relatively little money.
Sketchup
http://sketchup.com/($500 for Pro or Free for Standard) Sketchup is a very easy-to-use CAD program that scales well from tiny parts up to complete buildings. If you don’t have a lot of CAD experience, then you may find this to be a gentle introduction to the whole process.
One thing to note- only the Pro version is able to export an STL file for use in CNC applications. There are plugins available for free that add this function to the free version. Googling “Sketchup STL Plugin” should give you a list of the options that are currently available.
Free Cad Software For Macbook
FreeCAD
https://www.freecadweb.org/(Free) FreeCAD is a totally free and open-source parametric CAD package. Many of the open-source CAD/CAM options are a little rough because they are not incredibly popular so they don’t get as much development attention as more popular open-source programs.
Drafting Software For Mac Free
That being said, FreeCAD is worth a look if you want a parametric CAD program that doesn’t have huge maintenence fees (like many do) or risk having the price terms changed in the future (like Inventor Fusion).