HOT means Houdini Ocean Toolkit. It’s a plugin for Houdini created by Drew Whitehouse based on a Jerry Tessendorf paper. It allow you to create a surface that look like a deep ocean.

I’ve decided to almost “copy/paste” the code to allow cinema4D’s users access this tool.

The plug-in is on alpha stage. It mean all functions are not implemented yet or will be removed.
Only compatible with cinema4D R14 and more.