OpenCity
OpenCity is a free, open-source 3D city-building simulator with educational and customizable features.
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Urban Building Energy Modeling for Urban Decarbonisation Planning & Design with the Open-Source CEA-4
UrbanAna
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Streetmix
Open source and free, web-based street design platform, specifically cross-sections of streets for multiple uses.
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Radiance simulates solar panel placement, shading, and energy potential for buildings.