What's the best open source alternative to Sketchup? It looks like the Extrude Manifold tool in Blender 2.9 is the closest, but just wondering if others have other suggestions.
https://docs.blender.org/manual/en/latest/modeling/meshes/tools/extrude_manifold.html
https://docs.blender.org/manual/en/latest/modeling/meshes/tools/extrude_manifold.html