SketchUp

SketchUp models, component libraries and scene files: furniture, 3D model boxes, starter kits and complete scenes ready to import.

SketchUp is fast because it is loose, and that is also how models become unusable. Components instead of loose geometry, layers or tags applied from the start, and geometry kept off the default layer are the three habits that decide whether a model is still workable in week six.

For presentation, SketchUp is usually the start of a chain rather than the end of it. Scenes exported as line work and depth passes, then composited in Photoshop, give more control than any single rendered output — which is why the model's cleanliness matters more than its material setup.

See learning SketchUp as an architecture student, SketchUp model to finished render and axonometric versus isometric.