The creator utilized Mantra to render the sim.
Have a look at this majestic and hypnotizing 3D simulation of a raging stormy sea created by an aspiring Houdini FX Student known only as Helios. As stated by the author, the simulation in question was set up in SideFX's flagship software using FLIP (Fluid Implicit Particles) and rendered in Mantra, Houdini's built-in multi-paradigm renderer that implements scanline, raytracing, and physically-based rendering.
Attached below are some of the work-in-progress shots shared by Helios, you can check out more by visiting the artist's Twitter page:
And here are some great tutorials that will help you get started with fluid sims in Houdini:
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