Skyline3D

Skyline3D is a free architectural CAD for conceptual building designs. Users define multiple floors, place structural columns, and quickly add pitched roofs. The system supports massing studies, letting architects compare building shapes. A simple sunlight/shadow simulator helps pick orientation. Skyline3D exports to standard IFC or OBJ. Though less advanced than pro BIM tools, Skyline3D suits small architecture firms or students wanting a cost-free conceptual tool for early-phase building layouts and basic visualizations.