RobotMesh Studio with New Chrome Versions

There is an excellent parts library and part modifier add-in that is absolutely life-saving for modeling with fusion 360.

VEX CAD Fusion 360 Parts Library Release Log

People also say inventor is very good too.

Here is a pdf made by @kmmohn about the different types of CAD.
CAD for VEX Robotics (2).pdf (300.8 KB)