[evouga]

The paper is in LaTeX and uses the required ACMTOG template (also used for SIGGRAPH papers); you can get it at https://www.siggraph.org/preparing-your-content/author-instr...

The inset figures are probably placed using the “wrapfigure” LaTeX package. It’s janky and frustrating to use, but I agree the results look great!

EDIT: Incidentally the template changed recently and people within the graphics community complained about some aspects of it, e.g. the equation typesetting and how subsections and lists are formatted. It's good to hear that people outside the community like it.