Both Onshape and FreeCAD provide parametric 3D CAD modeling. Onshape is cloud-native with built-in collaboration while FreeCAD is open-source and desktop-based.
OpenSCAD and Onshape represent fundamentally different approaches to CAD. OpenSCAD uses programmatic scripting for precise mechanical designs while Onshape provides cloud-based graphical parametric modeling with real-time collaboration.