Radiance (https://www.radiance-online.org/) is a specialized suite of tools for analyzing visual environments in both artificial and natural lighting. It primarily assists architects, designers, and researchers in simulating and evaluating lighting and the appearance of spaces before they are physically built. The software is known for its accuracy and flexibility, providing physically-based rendering techniques that accurately predict light levels and appearance. Radiance supports a range of applications from daylighting design and architectural visualization to research in illumination and energy conservation, making it a versatile tool for professionals and academics in related fields.