Download of LeoCAD 21.06 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Design & Photo Tools, more precisely 3D Modeling. We recommend checking the downloaded files with any free antivirus. This free Mac app is a product of Edgewall Software.
From the developer:
LeoCAD is a CAD program for creating virtual LEGO models. The application has an easy-to-use and nicely-organized interface, so that you can manage it with ease. This software program currently includes over 6000 different pieces created by the ​LDraw community.
You may want to check out more Mac applications, such as Interiors, Cobalt or ysflight, which might be similar to LeoCAD.
3D Design