If the question is, "can you do 3D modeling with OpenSCAD?", then the answer is yes. However, as I understand it, considering OpenSCAD an alternative to things like Fusion 360 and SolidWorks and others, is a bit tough. The open source world also has Blender, with which you can do 3D modeling too. But again, as I understand it, the way these options work is a lot different and they lack many of the features present in the commercial products.

It is worth mentioning that there are a few 3D modeling options out there that are not open source, but do work with Linux due to the fact that they are cloud/web based. OnShape.com comes to mind.

So, while there are alternatives, sort of, Fusion 360 seems to be becoming the software of choice in "Maker" circles.

I am a beginner at this, so these are mostly just my perceptions. Eventually, I may be able to speak with more authority, or at least more experience.