Light Tracer – Experimental GPU ray tracer for web

Light Tracer is the world’s first solution for GPU accelerated, photorealistic client-side rendering inside a Web browser. Light Tracer uses progressive rendering mode starting with a noisy image and then progressively refining it towards the final result. Light Tracer is mainly designed to use HDRI environment maps, but it also supports mesh emitters and analytically defined emitters like spherical and distant light sources.

Source: lighttracer.org