I just released v1.0 of my zine layout tool for PDFs, The #ZineArranger!
Now you can do half size/quarter size/minizines with your choice of portrait/landscape, single sided or double, side fold or top fold, plus custom paper sizes!
@ken_fallon oops--yeah I forgot to set that! MIT license for the code; CC-BY-SA for the images. I'll add a more download-friendly version, too.
Hey Kansas City, be friendly!