A pre-release version of PFT: Box#3 has been available for a while, but the final version has just been released and can be found at Turbo Squid and Trinity Animation. "Particle Flow Tools: Box 3 Pro is primarily a toolset for creating your own custom Particle Flow operators, although it does come with several exceptionally useful presets"
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Very much like Houdini’s VEX for particles, sort of a visual programing environment. I’ve been using it in production for the last few months at Digital Domain.