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According to Caustic, it is also an extremely fast, high-resolution batch renderer that offers a unique way to create motion blur. In version 1.3, Visualizer is said to have received a comprehensive overhaul, so that startup times and the handling of CG lights are now optimized. The memory required for Visualizer is also said to be only a fraction of that in previous versions.
Here you can find various tutorials on the correct use of Caustic Vizualizer 1.3.
There is a free 30-day trial version available from Maya version 2012 onward. Here is the download. The full version is available in the Caustic store for 295 dollars.