PetaPixel

Virtual Lighting Studio: An Online Studio Lighting Simulator

Virtual Lighting Studio is an awesome new free studio lighting simulator that doesn’t require any installation — you use it directly in your browser. It offers a large number of options for customizing your setup (e.g. number of lights, light type, gel, positioning) and the result is updated in real-time on the virtual model’s head.

Virtual Lighting Studio (via Strobist)