3d structure with aluminium
2 Answers

1. Tinkercad – https://www.tinkercad.com
Free, browser-based, beginner-friendly 3D modeling tool.
2. Free3D – https://free3d.com
Download free 3D models in various formats, including architectural and mechanical parts.
3. Sketchfab – https://sketchfab.com
View, download, and share free 3D models. Great for visualization.
4. CGTrader (Free section) – https://www.cgtrader.com/free-3d-models
High-quality models, including architecture, furniture, and engineering items.

free websites you can explore:
FreeCAD (https://www.freecad.org) – Great for mechanical and parametric modeling.
SketchUp Free (https://app.sketchup.com) – Intuitive and browser-based, good for architecture and basic modeling.
Blender (https://www.blender.org) – Free and powerful for complex 3D modeling, animation, and sculpting.
Onshape Free Plan (https://www.onshape.com) – Cloud-based CAD for collaborative design.