Caustics can be described as the light pattern you see at the bottom of a pool on a sunny day. This tool will let you render such caustics light patterns.
The rendered images can be animated and are tileable in both space and time. This means that they are ideal for use in real-time graphics such as games and simulations, but can also be used for architectural renderings, film rendering or advertisement renderings where water needs to be illustrated.
THX to my buddy Achernar for letting me know about the tool 😀